Thanks, I’ll check out v2.0.0 
A bit more digging and came across this thread - [SOLVED but hopefully not the last word] Photons lose connection to wifi—any ideas? - and the 2.4GHz vs. 5GHz with the same SSID seems to be the issue. I can’t quite pin down exactly why it started now, but so far splitting off the 2.4GHz network and having my photons connect to that has done the trick.