Maybe causing interference? If so try changing the channel on your wifi.
To cause AP to go down completely should be more then just interference, if it was that it should just effect range. Only other thing I thought of is if he means his miner is a R1, I have heard of people using as a router and after a while with multiple devices it having problems. It was more of a lotto miner, not meant as a true router.
But we really need to know more from OP.