I hate whiners, be they people, gears audio components or me.
If it persists after everything is powered down for at least 20 minutes and then powered up again, ya' gotta do the eliminate one component at a time gig until you find the culprit.
Sometimes that kind of noise can be a byproducts of RFI/EMI that is transitory in nature due to some weirdness on the grid. I experienced the same kind of things many years ago when my neighbor plugged in a power generator to test running his home and did not disconnect it from the local grid. That was one weird noise.