As noted above the compression insulation type connections are subject to failure. If the problem is 1 or 2 lights, what I do is take a pair of lock jaw pliers and use them to tighten the connection, hand tight does not work. If you have multiple lights in one area that are all acting the same, then you probably have a bad connection in the wire feeding this area, I have seen landscapers clip wires with weed whackers. If ALL of the lights are flickering, check the connections at the power supply, including the outlet it is plugged in to.
If all this fails, send me a PM and I can help you.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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