How Do I Keep The Bathroom Light From Shutting Off Automatically?

There are two light bulbs in the bathroom -- the sink light and the main light. The main light will click and turn off when I believe it gets hot. I know it has not always been that way.It clicks agian and powers back on after 15 - 20 Min. It just gets really annyoing when you just got out of a hot shower and the... show more There are two light bulbs in the bathroom -- the sink light and the main light. The main light will click and turn off when I believe it gets hot. I know it has not always been that way.It clicks agian and powers back on after 15 - 20 Min. It just gets really annyoing when you just got out of a hot shower and the light clicks off and its really hard to see while shaving / or fixing hair. The sink light does not do this. Is there a fix? Thanks
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