My LED batten light works fine for about ten minutes and then starts turning on and off constantly (not really a flicker, more of a quick on and off). If I turn it off, wait a bit and then turn it on, the same process repeats, but after three or four minutes. Anyone experienced anything similar? Apart from this the light seems fine, so loathe to buy a new LED batten until I can work out which bit is wrong. Thanks for any thoughts.