Hey andy

Well I have been flying it in my living room with out problems. Also flyign it in my big garage with no problems. It was the first time I went outside. The heli would lift off and then come back down so I applied more throttle just thiking it was me not giving it enough throttle. Before I know it I am at full throttle, and the heli will get lite on the skids but will not lift off the ground and I am at full throttle, and it makes a sound like "surging/reving" up and down, while staying at the full throttle position.
I also noticed tonight I held the heli down with no blades on it, and throttled it up full throttle, and then while still at full throttle, it sounded and acted as if I reduced the throttle, and lost power but I didn't reduce the throttle. It was like it lost power after only a few seconds at full throttle. It kept spining but not at full power it seemed.
So I am so stumped, I am really having second thoughts about this heli, and walkera.
I did contact xheli and they seem to think Rx. They said to send it in and they would replace it for me. I do have a new battery on order I was just waiting to get it to try that just to make sure it is not a bad stock battery.

You thoughts? Is this fixable?
Thanks
George