My guess is that it not a serious problem. But I would also do a few other tests to get a better picture about how the pop is happening. I'd try to identify the way the pop is happening. Is it thru the power lines? Is it EMI (radiated energy)? Is it backfeeding from one of the connected devices?
Can you unplug all the inputs to the stereo and see if it still happens. If not, you can find the input causing it to happen.
Might try a long extension cord on the stereo to power it from a different circuit. Or power the offending device with it.
I have a similar setup. All power goes through a sine wave UPS for voltage surge/spike/brownout protection. No issues at all like your pops. All means stereo, alexa, TV, networking, streaming devices, etc.
All my other electronic devices (not also on their own UPS) are connected through an "ISOTEL6ULTRA" type surge protector. These are metal cased, high quality devices that filter noise and voltage spikes.
These devices should protect from a direct power line lightning strike, and lousy power.
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