Thought I would share this in case it helps others. I recently converted over to a bunch of LED's and thought I would share power cables with a bunch of other items beings I don't really need all that power now.
After doing all the regular troubleshooting I ran a power cord direct to an outlet and the issue went away. Amperage on the line when it was having issues was not high either. I have had two cases of this already and both appear to be fixed by running direct power to the outlet.
Even though I can't explain it. Hopefully it will help others as one more thing to check.