Roomba 4270 stops too soon. my roomba got weird all of a sudden. it started not moving all over as it should. so I tore it all down as I had done before and cleaned all the hair and dirt out of every thing I could without getting down to the basic shell. it does work now and does move all over but stops after about 10 minutes. brand new battery so not a battery issue. could I have plugged some of the sensors in the wrong 'plug'