I think it will be very helpful to provide a lot more information
Platform and mSFS settings - especially Live Traffic, PG, graphics options.
But also details of all third party add ons and whether installed or streamed. It may be important to understand what we have that might affect memory loading
For example I’ve got 4 aircraft installed and 8 third party add ons streamed.
I don’t use any third party airports.
So far I’ve had one flight in the PMDG B737-900 KDFW-KATL - and one flight in the PMDG B777-200LR EGLL-OMDB. Both flights completed successfully with no problems or warning messages.
I did start this thread for us to compare settings and see if there are any temporary workarounds…