I'm currently flying in africa. The demand is really low, no HD Mesh, no ortho, just default xp. I experienced it during pretty much all my flights. Some were at bright daylight, some at night (so the lights illuminating the clouds shouldn't be the cause). Sometime during cruise, sometimes during descend. If I go to plugins and disable smp and enable it again while flying, everything runs fine again. I'm experiencing this issue since the last update, because I bought rwc. This something that needs working on.
I'm running xplane 10.45, windows 10. And I'm running on an AMD Card, so it has most likely nothing to do with the driver! More than 1GB of VRAM and about 10GB Ram left!
Looking forward to a solution.
Edit: Attached my log from my last flight
Log.txt