Hi. i have 2 issues with the FF 767-300. 1.- When landind and after minimuns advice, the elevators get stucked and i can descend only. Crashed onto ground at 750 fpm. With the out of cabin camera 3rd person, the elevators doesnt move for climb. 2.- At cruise the plane starts to lose speed slowly until stall, overhead panel looks ok, no lights. I turn on the anti-ice since 10ºC to -41ºC. Both of these problems are random, maybe i can do a 12h flight with no problems or i have an issue with a 2 hours flight. Challenge options is zero. No failures sceneries loaded. No reports in the failure tab. I think I start with these issues with the 2 last updates, maybe before. I do a maintenance before each flight. I have done lots of flights with this plane and i know the procedures, where is the problem? Thank you.