It’s very prevalent. I’ve had it happen to me on three different glass cockpit aircraft so far (Kingair, Citation, A320). It happens every time, without fail, if you fly for around 1-2 hours. Quite a lot of people have reported the same issue, looking at the forums. To add to the problem it doesn’t always occur after 1-2 hours. Sometimes it’s sooner. Unfortunately it makes the game a little unplayable at times as you’re worrying exactly when it will happen. I’ve seen it mentioned that it’s possibly a memory leak issue but I can’t pretend to know what that means haha.