mine did the same i phoned deben asked if it was a common problem she said she had never eared of it, so i sent it back it was back in a week grate went out lamping put the lamp on first rabbit turned the lamp of to get a bit closer turned it back on well tryed f**k all no power, checked the lamp on another battery fine back on the phone to deben ( it worked when we sent it back to you) so back it went 2 weeks later and a new battery turns up now i just leave the plug in at all times and have put a conecter on it so there is no need to take it out