It's due to a TP-Link firmware bug. TP-Link support told me *my* device is defective and that it needs to be replaced (but if course, they won't replace it since it's out of warranty), but actually...

My Archer A7 router drops internet for a few seconds a few times per day. It's pretty disruptive when it happens. The router log says has lines like "teardown and release" shortly followed by "send...