There are no odd movements or electrical loads near the computer that I am aware of. The cables do not have a ferrite bead attached.
The issue seems to appear more frequently when I first log on to my computer, flashing black every second for 10 - 20 seconds. Then it flashes once a minutes for a couple minutes. Next it slows down to once every 10 - 15 minutes, and finally once or twice an hour. But there can be momentary spikes in occurrences throughout use of the computer.
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