Hi joshman123,
Since you say that this problem also occurs with a different radio/receiver, it doesn't sound like a transmitter or receiver problem. What may have happened is that something has vibrated loose in your set up. If you originally flew it 5 times with no problem, and now even with another transmitter/receiver combo, you are seeing problems, it would pretty much narrow it down to set up.
I would suggest checking your muffler or tuned pipe to make sure that it isn't loose, if you have an ignition system set up, try to set it up on the other side of your firewall.
Sincerely,
Krysta
Product Development & Support Specialist
Futaba Service Center USA
[email protected]