Hi,
During the day, one by one, ZigBee devices that were added on a ZBBridge-P started to go offline. Devices that are offline cannot be added again. Meanwhile, in the case of motion detectors, a change occurred, now towards the evening, 21:40 UTC +2, I managed to add them back, but the rest, which went offline cannot be added back even now. What is happening???
Thank you
I don’t understand the part about re-adding devices when they go offline.
Once paired, devices should always be added. If they lose connection to the bridge, I don’t think deleting them and re-pairing them is the solution.
I don’t know why they go offline; there could be many reasons. There was a thread about this recently.
I personally experienced offline issues when the signal was above 75 or higher, which is when the connections became unstable.
But the sensors usually reconnected after a while.
For some time now, I’ve noticed that “P” completely loses all devices, and despite a long wait, nothing can reconnect. The ZigBee LED is active and flashes…
The only thing that helped in my case was a hard power reset for the bridge. This phenomenon manifests itself after a few days or a few weeks. I didn’t have this before. I’m worried it might be something with one of the newer firmwares.
But I don’t have any evidence or specifics as to what’s causing it. I simply reset the bridge power supply.
And in your case, I can only guess…
it happened to me as well , i deleted the device (motion sensor ) and added again , so far now all stable
Now I can’t add snzb-01 to SONOFF Zigbee Bridge Pro .
I push pairing switch, the red LED blinking 3 times, turning bridge pro on pairing mode and the timer is going every times from 180 secondes to 0 and notting happend. The Bridge pro not dicover SNZB-01. I have 4 other SNZB-01 added to Bridge Pro which are working fine for now. What annoys me is that the SNZP-01 switch which cannot be added to Bridge pro can be added to any other sonoff zigbee hub (NS Panel Pro, zigbee bridge, iHost) without any problems. These problems with Zigbee Bridge Pro appeared after the last update, when version 2.8.0 appeared.
I also have problems with two zbbridge-pro
They went offline 2 times last week and they didn`t came back online at all
Only hard reset with cutting-off power for few minutes let them go back online, but in my case it is very, very , very annoying. I don`t have them in place where I live…
I have to go specially to the other end of the city where they are installed…
Newest 2.9.0
Could it be a signal interference issue? 
Maybe ensure that are away from internet router
Your situation sounds similar to mine.
My bridge has power and is connected to Wi-Fi, but the ZigBee sensors are disappearing/no connection. Only a power reset helps, although one is enough for me.
I’m planning to put a Sonoff Micro Wi-Fi between the PSU and the bridge to have a remote power reset.
We’ll see what changes 2.9.0 brings, though… of course, as always, there’s no official information about the changes. 
My zbbridge-p is about 3-4 m off the router..
This is summer house… and there is nothing near by that could generate interference
Totally agree
No information of Sonoff about new updates and its features…
I already have 2.9.0. but can`t see anything good
I`m also thinking of remote power reset but using S60TFP
I had the same happen to me with 2 different zigbee-p hubs. Different location same issue. The hub was online and all sub devices offline. When i power cycle the hub everything goes back online.
Unfortunatelly my zbbridge-p is not going to pairing mode anymore
Yesterday I went to location where zbbridge-p is placed and take s60tpf with me to install as a power reset device…
S60TPF is working just fine with its power off - power on feature… wifi signal is strong and without any interferences…
Unfortunatelly zbbridge-p is not going to pairing mode after power reset anymore…
I tried many times on place and then in the late evening remotely… I was waiting one minute, two minutes, 5 minutes then even half an hour between poweroff and poweron… zbbridge-p is not going to pairing mode after power reset at all… blue led is bliking one per second
What do You think is it fault of my device or rather software 2.9.0 ?
I unplugged and reconnected my “P” and it booted normally. It’s also on 2.9.0. It shows up in eWeLink and the sensors are transmitting correctly.
If the blue LED is flashing, there is probably a problem with the connection to the Wi-Fi router. For me, such a flashing blue LED usually means no Wi-Fi connection or unsuccessful attempts.
OK, but S60TPF which is wifi only works just fine… no isue with connection each time I power him off and on again…
I even tried MINIR4 as a power-off/power-on device but still no success
Edit:
I forget to mention… after power reboot zbbridge-p is not going to pairing mode it starts flashing one per second (all the time)
I placed the mico and created a scene that automatically turns it off and on for 30 seconds. I use water leak monitoring and the sensor can also detect offline status, so the scene says that if the water monitoring is offline, turn off the mico, wait 30 seconds and then turn it on.
I was thinking the same with S60TPF or MINIR4, but what is the point of that if doing reboot manually doesn`t work… automatic will not work either…
Edit:
I decided to make an automation anyway… maybe after the hundredth time it will finally connect…
Unfortunatelly it`s not working… it can`t be done…
In location I`m interested in I have only SNZB-02D, SNZB-02WD and ZBMINIR2 but none of them can be reasonably used for automation or I don`t know how…
Zbbridge-p offline can`t be used as IF condition in scenes as I thought in the first place… there is no zbbridge-p as inteligent device on the list…
So what`s left for me is to remotely reboot MINIR4, but still ZBBridge-P is not connecting to wifi
I understand. I’m not saying your Wi-Fi is the problem, I’m just sharing what it looked like for me sometimes. Of course, the problem could be elsewhere, and the flashing blue LED could mean something completely different, but only Sonoff knows that.
You can try periodically turning the power on and off, for example, once a day or more often, regardless of whether the bridge is working or not.
Regarding the bridge connection problem… Try restarting your Wi-Fi router, temporarily turning off other Wi-Fi devices near the bridge, and maybe moving the bridge to a different location.
Are you using OpenWrt?
I understand you’ve tried deleting and re-adding the bridge in the eWeLink app? Perhaps do a factory reset of the bridge…
I tried to restart my router many times so far - no result
I tried to move bridge closer to router - no result
I think it`s time for the final step before warranty repair - factory restore (as You mentioned)
I will keep You informed…
Thanks
Edit:
No I don`t use OpenWrt , I have original software… Everything works just fine till January…
I start to think maybe it`s because of the low temperature…
According to Sonoff specifications working temperature starts from -10***C and in my summer house is actually -3*C
or second thought: bridge “forgot” wifi password after so many power reboot attempts?
I doubt temperature is the cause of this… I find it hard to believe.
I’m more inclined to assume that something got messed up in the bridge’s settings and it might have forgotten something. For that reason, it would be a good idea to reset it and put it into pairing/adding mode.
I had similar problem with my ZBBridge-P. I changed the power supply and the problems disappeared.
