This is quite a common bug. From experience, this is because the AP gets confused, and tries to correct itself, even though it doesn’t need too. Unfortunately there isn’t anything you can do to permanently fix it (at least that I’m aware of) but if the plane starts to bank like this, take manual control for a few moments, and then reingage AP. Both the 747, and the 787 without mods are awful, and I recommend downloading some if you’re able too.
1 Like