I had the same problem a while ago, pretty much exactly as you have describe.
Check that all your bulbs are working and functional. Sometimes if one fails or there is a bad connection somewhere, it will cause other lights to fail or become intermitant. I found it to be my front left indicator bulb that had died and the bulb holder had rusted on the connections causing indicators to not work and come on when the brake was pushed etc etc
Hope this helps a bit!
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