you not running microsoft gaming services? are you sure? usually it comes preinstalled with windows and can’t be uninstalled in the app manager. it’s one of those pesky background services you should get rid off yourself.
and this is not about a memory problem, but a software problem. this software could tamper with your drivers and limit/lock the amount of vram that is available to other applications. if it’s running in background you should terminate it and forcefully uninstall it. it’s not required by the OS so it’s safe to remove and/but could be the cause of your issue.