One of 4 - RLC-410W WIFI cameras has stopped show live stream and recording
Other 3 all work ok. 
Both the Windows and Android client show all 4 cameras as connected.
I can interact with the camera via the client and can restart it as well. 
The WiFi symbol shows only 1 bar out of 3 for the camera.
I was looking for a log file but did not find any for the camera.
The camera is bouncing connectivity randomly.
As the low connectivity bar on the WiFi may be at limit of range?
But it has been working fine for a year.
All 4 cameras have the latest firmware installed. 
1 of the other 3 cameras has the identical HW and Firmware and is working fine.
Model - RLC-410W
Build No. - build 22042505
Hardware No. - IPC-30K128M4MP
Config version - v3.1.0.0
Firmware Version - v3.1.0739_22042505
Details - IPC-30K128M4MPS19E1W71100000001
Port is set to 9000 and IP is set to a static IP
I rebooted the camera from the client and also the wifi router- no change.
I did a hard power restart at the camera by unplugging the power for 30 seconds.
I was able to reformat the microSD card so space is not an issue.
I has been set to record on a 7 day rolling schedule. Working fine up to now.
Live Steam is set to Fluent but Change to Clear does not work on the failing camera.
Works ok on the 3 that are working.

Any help on this would be welcome.
Thanks
Steve