There is something wrong with the switch. I am not able to turn the unit on consistently. I know that I need to press the trigger 5x within 2 seconds. Sometimes it works, but most of the time it takes up to 5 tries, and sometimes I just give up because it won't go on at all. I've read through the whole instruction booklet. Battery is fully charged as well. Is there anybody who can tell me how to solve it? thanks for everyone.