GUYS I FOUND A SOLUTION !!
Since I got that error when I was flying over ireland and usually when I was flying Fenix a320 after 2 Hours the sound and FPS used to drop terrible, I was searching through different modules and what I did was, change the minimum and maximum on my pc Virtual memory and so far I have not gotten the error anymore
the steps to do it are :
Control panel
System
Advanced system configuration
Advanced options
Performance
Advanced options
Virtual Memory
AND THERE THE MOST IMPORTANT ONE
You will change to Custome virtual memory
it is around 4982 for initial and Maximum
on Initial you will place half of your RAM capability ieg: I have 32GB so half is 16 but it needs to be in MB so
Initial: 16384
and on max you will place all your RAM capabality again in MB
Max: 32768
Then SET
ACCEPT
APPLY and reboot your pc
So far and since I did the change my sim has not had any stutter , lag or performance issue flying on very detailed airports with good airplanes like the Fenix a320 and doing multiple flights and now using GSX, it is behaving awesome
I hope it helps you ! and good flights