It turned out my bluetooth headset was using the same band as the wifi but I only figured this out after a few months and a replaced wifi card. I wouldn't wish that experience on my worst enemy.
I had a fun one where every time I would get out of my chair my monitors would turn off, turns out the EM fields from the compression/decompression can actually be enormous in some cases.
Wait, can you elaborate? I have the same and I thought I was hallucinating or tripping a cable somewhere.
Update: reading the reg one, it also had no cusions, it was a standard herman miller so it was a mesh bottom and back.
The worst interference problem I've heard of is how USB 3.0 uses 2.4ghz and therefore can cause problems with devices connected with it.
*As an aside, one of my favorite things I get to do at work is when onboarding new Jr. Net Engineers is getting them take our spectrum analyzer into our office kitchen and instructing them to watch the spectrum turn bright red while I make a bag of popcorn.
Anyhow to get to your question, the best answer would be to get some distance between your microwave and set-up you're using with the headset. Otherwise if that isn't possible, then you'll want some headphones that does use 2.4ghz. Replacing the microwave will likely not fix the problem since they all use 2.4ghz band for cooking and at least I've never seen one shielded well enough that it didn't impact others while in use.
https://www.theguardian.com/science/2015/may/05/microwave-ov...
It would interfere with the Bluetooth signal.