Wifi Expander Noise

hello! Just got my MM and love it. quick question: when wifi expander is “connected”, there’s a periodic noise (like a very short noise snare) effecting my Befaco Output V3. this happens when there’s no patch cable connected to any of the module even. (probably radio interference?) it happens quite frequently (like 120bpm) when i’m connected to the web interface, otherwise it’s every 20 seconds or so (like pinging the router, keepalive signal stuff)

currently wifi expander is sitting next to it. MM, Wifi Expander and Befaco Output V3 are the only modules in this 34 pod, sitting in the order i wrote from left to right.
so:

  1. is this expected?
  2. is yes, would it help if i move wifi expander to left of the case?
  3. is there anything i can else i can do to get rid of this noise?

EDIT: Actually moving Wifi Expander further away from Befaco Output solved this (so my order is left to right: Wifi, MM, Befaco)