My jewel light unit seems faulty and I don't know how to repair or fix electronics and buying a new unit is last resort as I'm struggling money wise being 15 and they're up to 150 so please help. I turn the light on fine it all works exactly as it should for about 10 mins before they flicker and cut out, they then need to be left for a couple of mins before they will go on again. Any tips and adivice welcome