Rpi zero wifi noise on mic input

[fridgemagnet]

Hi,

I've just assembled my zero soundcard on a Rpi ZeroW, it's all working fine however I've noticed there is a lot of noise when using the mic input (which I've soldered straight to the board). A bit of investigation appears to indicate that it's the WiFi causing the problem - doing an 'ifdown wlan0', then performing another recording and the noise disappears.

I've seen mention in some of the other postings about issues with WiFi but this seems to be more related to the audio disrupting it, not the other way around so wondering if anyone else has encountered this & what a solution might be.

Rgs,

Jon.