I have an XHC PHB04B-4 wireless MPG in my Centroid Acorn system and I've never had a problem with interference. The closest I've had is loss of signal due to the pendant being shielded from the receiver. At that point, the handwheel doesn't do anything which is a sort of failsafe outcome. The solution is not to pile metallic objects on top of the receiver and/or position the receiver in line of sight of the machine.

I have the control PC at my desk a couple of metres away from the machine so I can also do Fusion work and of course play music, surf etc while it's machining. The latter is something that should never be done I'm told but it works for me....