Sounds like a bad power switch. Check the owners manuel to see if the factory defect warranty is still good, depending when you bought it and if there are signs of abuse. Contact Horizon Hobby to see if they'll help you out. I just checked my remote and it doesn't look like the switch is servicable, you could take it apart and hot wire it but when your done flying you'll have to take the batteries out. Or just get one off Ebay new for a decent price. Just some ideas, good luck!