Sounds like I have a similar, but maybe more weird issue...
FSD will work fine for some time after I start the drive (time varies, between 5 - 60 min as I have observed so far), then after one disengagement, it won't let me engage again if speed is over 28 km/h (17 mph), consistently for the rest of the trip. The grey steering week and speed limit sign will not appear. And if I try to engage, it gives me warning that "Autosteer temporarily unavailable". It would allow me to engage FSD when speed goes lower than 28 km/h, but FSD will behave weried - when it try to make a lane change to follow route, it will turn on turn signal but won't make the actual lane change completely; it drives super slow for no reason... Basically not usable.
When the issue happens, FSD visualization was fine, and I could also engage regular Autopilot by disabling FSD in menu.
I checked in Service Mode, the FSD cameras and sensors are all showing as in Green status. The only alerts I saw was "PM_w041_dasMIA" and "THC_w0122_condLeftShutrNoFeedbk".
The issue would go away if I left the car parking for sometime, then it might come back again randomly in next drive. It's been doing this for last couple weeks.
I have tried the following but no avail:
- Restart car
- Recalibrate camera (car was fine for 2 days, then bad again)
- Reinstall software in service mode
- Reset DAS in service mode (car was fine for 2 days, then bad again)
My car is 2017 Model S, originally with HW2.5 (now with MCU 2 upgrade and HW3 upgrade)
Current FSD version: 2022.44.30.5