Unplug the dryer.Pop your head inside the drum, at the bottom (6 o clock ) just under the removable filter you will find a cover containing 2 metal strips, remove this by means of unscrewing the 2 recessed screws, turn it around and you are likely to find it clogged up with fluff. Clean this off with a small brush, re-assemble. Just may do the trick, mine did!
Stuart A, April 2015