This is a sporadic problem that comes up regularly. If I'm driving a vehicle it starts out fine but after a while (varies) my heading suddenly veares off and I am headed in a direction I cannot unlock. In some cases I am able to recover control and can unlock the heading (rare)- but most times it stays locked. The only solution I have found is I have to reload the craft - though not truly a solution since the bug generaly returns to haunt me again after some brief period of time. This is a really annoying bug - that I hope there is (or will be) a fix for.