So after a few months of no pops and cracks... it's back again for me. Coincidentally (or not) just after the last big update.
I stupidly didn't write down the process I followed to clear out the drivers and settings. From what I can't see any evidence the Realtek drivers have returned, it's still using the default Windows ones.
I don't think it's power supply or anything hardware like that in my case, as the problem also exists if I send audio via BT direct to my Edifier speakers. And the pops seem to coincide with doing things n the computer (Switching tasks, scrolling, etc). If I sit there and don't touch anything, then I don't get any pops.
Completely frustrating. Especially when we all might have slightly different causes, we just have no idea.