Bulbs in bathroom go out after 20mins then come back on about 5 mins later

The problem you have is as been highlighted in the other posts the transformer is overheating and cutting out, then as it cools down it resets and the lights come back on again. Its likely that when the lights were new they had either MR16 20watt or MR16 35watt lamps in them. Because they have been replaced for higher wattage lamps (i.e. 50w ones) they are drawing more current and this is causing the transformer to work harder and hence why its overheating and cutting out. Easily fixed buy some 20watt lamps for a few pounds, pop them in and an the problem should dissapear. The guy who fitted the 50watt lamps should have only put the same rating ones back in not higher wattage ones! Hope this helps, please click on "like" if it does.

Dear Customer, Sorry to hear this problem with your light and your previous electrician. The problem with your light could be malfunctioning of your LV transformer for the particular light or Thermal cut out inbuilt in transformer for safety operation if the transformer and light source are too close in your ceiling. Other solution: Get High Power LED warm white or cool white GU10 and remove your problem forever (35000 hours ...Life) this data is from average available product from the current market. I advise you if you can wait for few weeks than write or try to call that electrician and if you can't trust or have no time to mess around than log your small job on this web site and get different quote and help. You have right to call electrician back within reasonable time for free check up of their work if they provided you transformer (material) as per goods and service act 1989 (please check this on Google)... You are welcome to contact us from my builder and we are happy to help you. We are OHM ELECTRICAL AND IT SOLUTIONS LTD from Wembley I hope the above information could help you decide your next step! All the best OHM TEAM

Sounds to me like the bulbs are getting hot. I would have a look in the loft and remove any insulation etc from around each fitting to ensure there is not problem there. After that another option 'may' be a loose connection on a fitting or worse, water vapour may be getting in the fitting (I make the assumption your in the shower / bath as the lights are on a long time). Try opening a window or putting an extractor fan on when your in there If neither he above helps it might be time to bite the bullet and get another spark to take a look. Most tradesmen will offer to look for free anyway and only charge when they fix the problem. I would stress that if the other spark merely changed the bulbs, then any fault won't be down to him I'm afraid

I think the problem is with the transformer. Its either faulty or too many lights have been fitted to one transformer. The transformer has a safety cutout which turns off when over heating then comes back on when cooled down.