(UK) Ring Alarms goes into 3G mode every evening at 11.04pm, and back to WiFi at 6.04am

Hi all, For the last 5 days straight, my ring alarm (UK based) has jumped onto 3G backup at 11.04 exactly, and then reconnected to Wifi at 6.04am. I believe this happened straight after an update after a power off (although I can't find any diagnostics on either the upgrade or the errors). I have tried; 1. Switching Wifi AP's between 2 different AP's 2. Switching from 5Ghz to 2.4Ghz 3. Reboot of base station I have other ring devices running on wifi that remain connected. The alaram base station IP address is DHCP reserved (and has a long lease length), so I don't believe it's address related. I'm also 99% sure my router doesn't disconnect it with some strange timed base rule. Next steps are; 1. Hard wire to ethernet to prove wifi issue or not 2. Factory reset - engineers fix :) Has anyone elese experienced this as all? Any help appreciated! Regards, Jason