Guys, i've been dealing with this issue for several years.
I'm currently using an iPad Air, and I AirPlay mirror the device to my PC using AirPlay receiver software called Reflector.
My PC is on wifi, connected at 200Mbit.
My iPad is also wifi (of course).
My router is dual-band.
I have drastically reduced the audio pops by changing the 2.4G and 5G channels on the router.
I live in a high-rise apartment, so I do have a LOT of neighbours that use both the 2.4G and 5G bands, I currently can detect 15 other wifi signals.
I used software which could determine the best channel for my router to use, and I don't get many audio pops anymore, but it hasn't completely gone.
If I switch to other channels, I could end up with audio/video lag/dropouts.
So some advise - experiment with different channels on the router, if possible run some software to find the least noisiest channel.
Maybe some of you solved your problem by accident, just because your neighbour changed channels on their router, and are no longer interfering with your wifi network!
PS - I notice that I get a LOT more pops during certain times of the day (mostly after 6pm), this is because some people leave their routers off during the day, and theirs doesn't auto-detect the best channel to operate on. So when you're having issues, re-scan your channels and find a better channel.