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spot lights switch off after being on for a short while?

When we switch on the spot lights, they all work but after a while some of them then switch off. The nexst time we switch on the lights the same pattern repeats itself. Any idea why this may be the case? Txs
gb, March 2009
many txs - will check the transformers. gb

gb, March 2009
if they are low voltage, the transformer is overheating, if the lamps screw in and they are 240 volt the connections at the back of the lamp are arcing... careful....

johno, March 2009
Are they low voltage? It could be that the transformer is overheating.

Adam, March 2009