I have been having the same issues.
I find that the TGP screen blanks out randomly. This is not the same as when the aircraft blocks the line of sight, but it just goes blank.
I've also found that the TGP is unusable at night. I cannot see anything when using BHOT, WHOT or CCD. I've tried adjusting the contrast and brightness but I mainly just get a white screen with some vague shapes but impossible to make out targets.
It's very frustrating! I will try turning the 'chimeny stack' to zero but not sure I want to delete folders.
