In 4 years I've had 1 wireless router but 3 power/ac adaptors, it could be that maybe? Usually though when the powers gone the router doesn't switch on at all.
When your router starts disconnecting and reconnecting like crazy do you power cycle it (turn the power off for 1min then back on)? Does that improve your connection / stop the constant reconnect / disconnect? Wireless routers go all the time. I've had 4 in the last few years. The wireless radio inside goes first, and…