I have a non-Apple TV that supports AirPlay and sometimes when I try to get my iPhone to play something on it while the TV is disconnected (completely off) it c

I have a non-Apple TV that supports AirPlay and sometimes when I try to get my iPhone to play something on it while the TV is disconnected (completely off) it causes my ASUS router to drop the WiFi signal completely for a few seconds. I have a feeling that the iPhone keeps searching the network and my router cannot keep up with the requests or something? Not sure but that's a theory I didn't get a chance to investigate