I was having trouble for months getting my Pan Cams to function. (Insert head-banging emoji). I could get them to work after the standard reboot recommendation but within a few hours there would be no image in the app. I saw a post from Wyze that they were looking into a problem with Asus routers. I picked up a Netgear Nighthawk R7450 on sale and the Pancams so far are functioning perfectly.
I just saw a post about disabling a function in Asus called “Airtime Fairness”. That sounds like worth trying if you don’t need a new router as I did.