My Tao XM2go shuts off for no reason during operation in both my car and at home. Pressing the power button will turn the unit back on. The unit may operate for several hours or several minutes but it will turn itself off again. The does not seem to be heat related and there seems to be no pattern to the failure.
You could try taking the batteries out and cleaning the contacts, replacing the batteries and/or using sellotape to hold the batteries in place. They could be loose and disconnect when you move it in a certain way. If not the batteries, you could try further dismantling and cleaning, but you may just end up with a clean ball of sellotape that still has problems...! worth a try. stoodleysnow
Usually answered in minutes!