Orbi RBR750 intermittent lost connection

The only devices that move around are phones and iPads.  And we never, or rarely, stream to a phone or iPad, only stream to stationary devices like Apple TV, Roku, etc.  And this doesn't happen EVERY time, but often, if you are looking at something on a browser, email, etc. in one room, then you put your phone in your pocket, go to another room, look at it again, you can see it connected to wifi, but stuff doesn't refresh unless you go to airplane mode, wait a second or two, then take out of airplane mode, and then everything works perfectly. I've never had any trouble on hardwired devices (hardwired to any of the orbi devices), or on a stationary device, only on things that move around, like phone or iPad, occasionally on a windows laptop.