787 LNAV bugged

wasted a hour of cruise time because the LNAV in the 787 decided to just start banking off the route path. ifr flight plan with legs. i tried disabling A/P and LNAV and getting it back on the route path but it just started banking off the path again. this is 2020, FSX in 2006 had fully working autopilot, why does this game not have it?

Beautiful scenery at time im enjoying very much but soooo many issues…

I fired up the 787 for the first time earlier. LNAV wasn’t an issue for me, but VNAV kept trying to drive me into the ground. All of this I can deal with but 16 FPS in the cockpit over an empty ocean tells me they got some work to do on optimizing it. My frames were fine until I started plugging a route into the FMC. This is especially worrying considering we had to pay extra for it.