The only time I have had a monster do that was when it was all over. I would check all your connections, battery receiver ext. Try linking it with the castle link see if that does anything. But I hate to say it doesn't sound good. On the bright side castle has a great repair department. They are so awesome there that sometimes if you write to them and tell them what happened they will even ship the new one before they receive the old one. the only other thing that I have seen happen its that the switch goes. Try wiggling the components around inside the switch with the batteries connected. I think I've had 3 switches go on me there kinda cheap.
Good luck