My controller also having the same issue, the 2nd controller that I bought so far no such issue. After some checking, confirm it is the battery holder loosen already, now using paper stucking method, will consider to take back and ask for replacement since it still under warranty.

I jsut get one and I stuff the entire space up with a duct tape.

That makes the battery supar hard to sit, but also will not disconnect after locked in properly

i already put a selo tape,also the controller disconnect(it has 2 bar left)

then i changed to a new battery(4 bar) ..works well..

could be the battery ..

LOL!!
the indicator never accurate wun. if the controller always off by itself then time to change battery.