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« Last post by RoGeorge on Today at 12:01:26 pm »
I would disconnect the LED strip and check the (group of) LEDs individually, one by one, with a DMM or with a voltage source + series resistor + 2 wires. Could be that one of the many series LEDs is defective (interrupted) and when the voltage across it becomes too high, it short-circuit itself and lights up the rest of the strip, but at a higher voltage than it should, then the overcurrent protection turns all off, and the flicker repeats just as the defective LED would be the starter in a fluorescent tube lamp.
If not, then maybe check for dried out electrolytic capacitors in the power supply (though, they all look OK in the picture).