I bought my T1 about a year and a half ago. I charge it, set it, and am able to change bags, but the lid doesn't open. I re-set it according to the directions in the manual, but the sensor doesn't work, and the lid won't open. I've cleaned the unit, reset everything according to the manual, but the light sensor doesn't work when I wave hand over it. I switched from regular bags to bio-degradable bags a while ago. Could that have anything to do with it? Could the sensor be broken? The unit has not been knocked or dropped, and it still replaces bags although I'm only replacing empty bags because the lid won't open. This unit is a year and a half old. Is the whole unit dead? I've already order another completely new unit, but I don't know whether my old one if fixable or whether I should just toss the whole thing out. Please advise.