Question Sudden loud white noise from speakers

Jan 22, 2021
Woke me up 2 times at 5am with a horrible ghostly and loud static!
I think it sounds like 60Hz

I have NAD T741 receiver and the source was PS4 (shut down at both occurrences) through optic cable.
When I turn it off and on everything is back to normal.

There were multiple power outages at my place recently and the electrical wires are quite close to the audio ones.

Any idea what can that be?
I was told that old units can have a risk of catching fire when they start malfunction this way, is that something I should worry about?
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