hey , i had the ofna force 25 before, that problem was sometimes (very often) caused by the back plate rattling itself loose, regardless of if you loctited it or not before, take it out, and check your backplate... i blew an engine because the damn thing kept comming loose, and ofna wouldnt send me a new one regardless of me having a receipt and sending the blown motor back . .. and now they have discovered its a problem , i could have told them that in the middle of the summer, ill never buy an ofna again.... sorry for the rant , check the back plate, the throttle control on the radio , and the linkage also