Ok flying day

Well today I started at 5.30 p.m and ended at 6.30 p.m. Today's flying session was OK but something has happened during my second lipo. My Elite seems lost control during nose in descend. The motor stop responding for a second. I land and check for problem. It seems that everything is OK but then I had noticed something. My throttle stick revolution seems weird. When I pull up the throttle around 10 percent there is no respond but then only after 10% then the blade start spinning. Other than this everything was fine. Well this is common problem just reprogram my ESC then walla..problem solved. Overall today's flying session is OK but not as good as the day before.

The following images is my regular flying site. It's an archery range in UUM. It's a nice place to fly small electric heli and plane.