Hmm....well I see some things you need to change in the future. Always use a fully charged battery to begin a flight. Taking off with a bat a 15.3 v is dicey. Flying a bat down to 14.1 v is even worse. That is dangerously close to a shut down. You should be on the ground with at least 14.5 v. The aircraft can become unstable at low voltage.
Also, give a bit more time on the ground to get at least 15 sats before you start the motors.
The H was tilted to 7 degrees on bootup. If it was on level ground, then the accelerometers need calibrating. Make sure you set the H on a level surface for launch.
If you have a landing problem where the aircraft doesn't want to descend, there are several options. The first is to climb up another 20' and try again. If it still won't come down take it out about 50' and climb to the RTH altitude and then try the Home mode. If it still fails to land, go to angle mode, bring it in about 25' away, turn the aircraft so you are looking at the tail, then turn off the GPS. You can land for certain. I should also mention, if you bring it in close and as low as you can get it, then let it hover, it should land itself when it reaches the third bat warning.
The only way to get a response from Yuneec is by phone. They rarely respond to an email. I understand they are closed right now while they are moving their operation to a new location. I have heard nothing about a time frame for re-opening.
Rarely responding to emails from a deaf client is a clear violation of Federal regulations. Wells Fargo was fined several million dollars on a similar issue. YUNEEC OFFICERS ANSWER EMAILS PROMPTLY or you just might get a call from DOJ