Sounds like you have a short and the circuit breaker is kicking and resetting, could be high resistance on on or more bulbs or a weak breaker. I'd start by locating the breaker and replace that with a known good one of the same size, if that doesn't fix it then find out what is on the circuit and start pulling bulbs till you find the problem. With the breaker changed and all the bulbs pulled (except on for test) the problem persists then you have a wiring issue. If it is in the wiring get it fixed ASAP it could cause a fire!
Most tool trucks(Snap on, Mac, Matco) have a 'short finder' for sale, I don't remember what I paid for it but it works and was well worth the money! Have fun
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