I notice some stuttering in the controller responsiveness and earphone audio when I play and somebody turns on the microwave.
Plugging in the controller via USB does not help. I expect it to work better over USB since it shouldn't use radio anymore. But it doesn't help.
Do I have a bad DualShock 4 or is this just the way it is?
you dont have to worry bout interference from other controllers from how i understand them to work is they each get thier own frequency of sorts(frequency is the wrong word having problem thinking of the word i want) and the interference we are experiencing i foudn out mine wasnt actually with the controller it was a issue with the outlet i was using not supporting enough power to the system, if i plugged my vaccuum on another circuit my issue was gone no matter if the vaccuum was in the same spot or not. Your issue may be a bad controller getting interference from microwave, just buy a new controller put that one in the box and return it tell them it didnt work for some reason walmart takes anything back.
oh btw i was wrong with the wire, found out it does transmit through usb when hardwired in.