I’ll just mention we are presently troubleshooting very similar issues at three locations with v3 Wyze cams and in use with Peplink APs. At this point our prime suspects are the Wyze products – not the Peplink equipment.
I’ll point out that in one location we have a v2 WyzeCam which works fine about a foot from a v3 that does not, both registered to the same AP. Not a signal strength issue. Works fine for a while – then goes out to lunch after a few hours. Captured video is not uploaded.
We just started working with the outdoor versions. We need to spend some more time with these before we feel comfortable. However, the first time we visited one it had selected a 2.4GHz channel that was in use by a Peplink AP not more than 20’ away - very baaaaad. So, in addition to @MartinLangmaid’s suggestion (above) you might want to check the channel in use to see if there is a conflict there.
As I said, we have much more to do with this issue yet.