It's been two flights where a warning saying that my pitch trim setting is too high for TO (I don't know the proper wording) just after I set the throttles to flex then around 80knots the warning stops and after some seconds the aircraft pitch up without any command from me and lift off before even V1. During the flight just after I engage the autopilot some second after it disconnects alone (no warnings), and every time I reengage it, it disconnects after some seconds. I checked the pitch trim setting during TO and it is at the proper setting of UP0.7. I use the fuel planner X, I put the departure and arrival airports then choose random passenger and cargo, I check if all the values are in green and then I write down the trim setting. In FSX I load the loadsheet and in perf page I put 2/UP0.7 (or whatever setting I wrote down earlier). It worked perfectly for a year but now I don't know what's happening. Is there something I should do in the fuelplanner ? (adjust CoG or something else I never touch these settings) or is there something else I might be doing wrong ?