An SSD can run virtual memory almost as fast as a memory stick, since an SSD is basically a giant memory stick. On a side note, replacing your hard drive with a solid state drive will also fix this issue. Restarting the game purges the memory, too, making it 'refresh'). When the virtual memory is running out, your game crashes (so that all the memory it's used can be purged. You can keep playing with the virtual memory until it, too, runs out. Virtual memory is much slower than physical, so the game slows down. When the virtual memory comes in your game starts to slow down, which you see before it's crashing. This is where your virtual memory comes in. Due to the unoptimization, the game is using up memory and the computer can't purge it quickly/at all, using all of the physical memory. Gmod is VERY unoptimized for new systems. I can tell it's hardware due to how you are on 64 bit, are still getting out of memory errors, and that restarting the game 'refreshes' how long until you have to restart again.

Okie, so! I see it is a memory issue! Sadly, Tjm, you will have to raise your memory.

Fast ways to crash a gmod darkrp server