Just had an issue in an entirely unmodded install. Flying the TBM IFR and after about 45 minutes while descending the altimeter froze. As I was approaching the final phase of the flight I had to abort and return to main menu. I’ve had problems with Garmins in other aircraft and have been able to restore things by opening the flightplan but in this case nothing seemed to work which was annoying. I had flown the exact same flight yesterday with no issues whatsoever with the only difference today being that I was using real weather. Is this what is causing the issues with the Garmins perhaps?
yesterday the 17 of october i had the same issue with the CESSNA 172 SKYHAWK plane goes up just after departure but in the PFD the altitude is frozen. i let go to 4,000 and nothing change in the pfd altitude. ive never had this issue but since 1.9.5.0 i got it. i dont know whats going on they fix issues but we got issues elsewere.
Altimeter only or the complete Garmin PFD?
Just the altimeter in the TBM. Can’t change the altitude nor the VS either even though both controls seem to “work”.
Just tried it again with fixed weather and the same thing happened again. I forced it back by using the old “delete the last waypoint in the flightplan” trick however that seemed to screw up the eventual ILS approach in that the bugs were absent although the aircraft did fly the invisible glidescope when I hit APPR.
All very strange and a little frustrating.
Ignore me if unrelated but did you turn the pilot heat on?
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That would be my next Question. Freeze Garmin is a Bug, but freeze altimeter only sounds like icing. I never had it, because normally airspeed drops to zero under icing conditions and pitot heat of, but maybe they worked on that and you can face different symptoms.
Must admit I didn’t turn the pitot heat on. Airspeed wasn’t dropping and only at 12,000ft in clear conditions so it didn’t occur to me. Maybe I’ll try that next time. Although it doesn’t explain why I couldn’t set the altitude does it?
Pitot heat has to be on during flight. No matter which conditions you’re flying through.
I don’t know why you can’t change the AP. Might be a logic behind but I wouldn’t expect that in the sim.
This problem started after patch number 3, not after the most recent patch (number 4). I have seen it happen on the C172 G-1000 and the TBM G-3000, (no mods), though it may affect the airliners too. It typically seems to happen during descent.
The PFD freezes. Both altitude and airspeed are stuck at whatever reading they were showing at the moment the freeze occurred. The autopilot continues working, and the standby altitude and airspeed indicators continue working.
This is not a symptom of pitot tube icing. The two times I have seen the bug, the outside air temperature was well above freezing, and the classic symptom of a frozen pitot tube is that the airspeed drops to zero, but the altimeter keeps working.
I have read a couple or reports that doing a direct-to the next flight plan waypoint may unfreeze the PFD. The two times I have seen it happen, it fixed itself eventually, and it may well have happened when passing a waypoint, but I am not sure.
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That’s because I’m asked. If everything was frozen, than it’s the Bug. If only the altimeter was frozen and rest of PFD is fine…
Pitot heat only effects the airspeed. The altimeter uses the static port, which does not get warmed up by pitot heat. If the static port were to become clogged, all of your pressure driven instruments would go whacky. This sounds like a bug.
Haha ! Awesome ! This could be far more dangerous than forgetting about pitot heat 
I had this issue occasionally with the C172 and the TBM. It also started after patch 3. But 1.9.5 actually fixed it for me. I haven’t had the issue since the latest patch.