Ur28 power problem

Hi everyone! Does anybody know about UR28 not turning on when you press the power button anymore. It just becomes lighter and thats it, it fades then and device stays off. It happened after 3 years of successful usage. I am able to turn it on now sometimes when i get lucky but something is not right. Sometimes it helpes when you turn off some other electic devices from the outlet, for example if you turn down the lighter it might turn on then, but that does not always help. Been surfing all the web but there is no such information on it.

problem still there?