Camera / App issues

I have 5 cameras , 3 V 2 and 2 V 3 - I am constantly having issues with the cameras going off line, not available or having to manually reset them. It wasn’t u til this last firmware update that it started. I have a small SqFT so it is not distance and the RSSI on the Wi-Fi is a -30 so it’s got great signal. Any reasons why these would constantly be doing this? The V2 are not even a year old and the V3 I just got last month.