If both of your monitors are doing this, then you probably have a bad electrical socket(s), poor grounding, or a magnetic field near the monitor location, etc. Just because you plug things into separate sockets, doesn't mean they are isolated. Many sockets in the same room or adjoining rooms are all wired together on the same circuit, and will all have problems.
If you have any type of magnetic field present near the monitor, it will also cause jiggle. Magnetic fields could be caused by power cord wiring (try rearranging your wiring), water pumps, unshielded speakers, and various other electrical gadgets around the house.
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