I have had a similar experience with a Hobby Lobby "Winged Dragon" park flyer. It's difficult to take off from the ground, I think it could use more power. No problem with my motor quitting though. Could it be your motor is overheating? I'm going to try flying mine again and if it still seems underpowered I'm going to consider another motor. LiPo batteries are expensive though.

Good luck,
Bill