You should be able to reconnect to the same WiFi without getting that error
Is there a chance you got a software “upgrade” that made it mode-switch and it’s ended up on a 5Mhz channel?
One of your neighbors could have added something that’s messing with it (which is frustrating, but does happen - let’s not go there yet!)
Those logs can be helpful to the staff, but yeah, they’re not designed to be readable.
Speed is less important that reliability. Quick blips that wouldn’t be noticed by TV/computer/etc. will seriously mess with the 
- can you do the test after " We’re not finished!" here: Displaying as "Calibrating", then reverting to "Offline"
If there’s serious blips that may give us an answer, if there aren’t it’ll be helpful to the staff person who eventually gets here.
Fingers crossed!