@Kaega The factory reset that I spoke about seemed to do the trick, and I've had a rock solid connection with my AX6600 since then. No issues.

After the factory reset, the firmware version I'm running is 1.1.5 Build 20210903 rel.39200(5553), which is up to date for my AX6600.

Factory reset is holding past the one hour mark, so far. If I have any more issues, I'll try the beta firmware update. So far, so good!

@RouterRob Thanks! I'm going to hold off on the beta firmware until I know whether or not the factory reset worked. Thank you for your response.

@RouterRob What kind of router do you have? I've got an AX90 and this just started happening to me between last night and this morning – the router loses connection every hour, almost to the minute...