Some lighting systems do indeed have thermal overload switches built in them, to prevent overheating. Can lights do, the warning label indicates that. Are the track lights Halogen? These bulbs get extremely hot. As far as flickering, could be a bad socket or another power using device on the same circuit and it is going on and off. Lights plugged into a refrigerator circuit will do that when the compressor comes on and off. Lights powered through a wall switch that sometimes work, sometimes not, are usually traced back to a loose wire on the switch, particularly if back wired, or a faulty switch.
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