My bluetooth mouse have stopped working - can it be confidently fixed? I don`t know its the circuit inside or something...?

My bluetooth mouse have stopped working - can it be confidently fixed? I don`t know its the circuit inside or something...?

Is Bluetooth pairing lost? You involve it paired up first. Check that first.
whenever this problem occur try re-booting your computer and if it persist and you quite sure the battery are ok then you own to purchase a new one