Yes, you probably have mechanical connections at the ends. Try this, when the LEDs start flickering apply some finger pressure at the end where the wires connect, if the flickering stops you have found your problem. Now the bad news, I do not have a fix for this short of removing the faulty connector, and soldering the wires. I have installed several sets of under and over cabinet LED strips, and I always solder the connections, I do not like the mechanical connections.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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