Was flying into Denver last night and on vatsim so if you heard me just trying to get this bird down, yes it was rough. Would like help thinking what could it have been.

So first:

1) game froze mid flight 2) heading was off by 8 - 12 degrees, with autopilot noticed this on approach when I was getting called 80 and noticed I was going 72 or 68 at time. 3) conditions were -12, with all icing turned on 4) cabin depresarized on approach..... (coincident?) 5) programed 34R and it was bringing me to 34C but clearly marked and controller was telling me headings. 6) no warnings besides low fuel (I did missed approach)

So what the hell caused it? The freeze or something else. Winds weren't calm but were in margins.