I had one that ran great. Just keep trying once you do find the sweet spot it should run great. I had a sixty size on one time that had a hole in the case somewhere it stayed dirty, but I did not realize it had a hole. I thought it was just because it was on front of a stick. I sent it in and they sent me a new one. It would stop at anytime in flight. This all developed after I had it about a year. Is it dirty even after you clean it. This may be a problem with yours if so.</p>

Good luck</p>

Alan</p>