Flickering LED strip lights
Today I helped two neighbors with exactly the same problem flickering or dim under cabinet LED strip lights. In both cases these appear to be installed when the houses were constructed (south of 44) and in both cases the plastic connector from the power wiring (24 VDC) to the LED strip had bad connections. In one case it appears the connection was bad at the LED strip, in the other case it appears the bad connection was to the wire.
In both cases these were compression insulation piercing type connections.
In one case this was found by applying pressure to the connector and the flickering stopped, in the other case the connector was observed to be warm to the touch.
In both cases the connectors were removed and replaced with soldered connections.
IMHO if you happen to have flickering LED strip lights or LED strip lights that dim on their own, check connectors. I have seen these fail several times over the years from different manufacturers.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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