So i’m not going to say that it is 100% the solution - but so far this has worked for me 1/1 flights!
Rather than mess with the bios (my laptop didn’t make changing the CPU settings very intuitive) I downloaded the Process Lasso application and just disabled 2 cores for MSFS2024 alone. Simple and seems to be working. 10/10 will try again.
TY wcc96387