2017-10-26, 18:40:30
Iv'e been having the same problem as well since I got the 777. Usually occurs after 3 hours into the flight. It occasionally happens with the NGX. As far as I know, there doesn't seem to be a known cause or fix. It only freezes for me when I use FSXWX so that indicates it isn't just an issue with the PMDG. Hopefully someone can look into it.