why does resetting a audio amp make it stop buzzing?

[coppercone2]

I have a HP supply amp set to a speaker for a year now. Sometimes (maybe once a month? sometimes much less) it gets this static hiss noise.

All I need to do is turn it off and on again and it is quiet.

Is it something with the power switch? makes a bit of a pop when you turn it on (normal)

its fully analog device.

my theory is that the switches are dodgy and the inrush current to the speaker cleans them out. treated with deoxit

[Swake]

Static is frequently linked to grounding and picking up noise from the environment (LED power supplies are horrible) or bad wiring or... a million other things.

A lot of things happen when off/on an amp or power supply, including emptying a lot of capacitors. There might be a component that touches the chassis (leaking) and builds up charge over time, speed depending on relative humidity. The minuscule temperature changes during the power cycle.

[coppercone2]

i dunno that thing aint too tight in the chassis I don't see how something is shorting or touching