Since GameGuru is long-running and does a lot of allocation and freeing. It's when you have mixtures of short-lived and long-lived objects that you're most at risk.
GG has allocation failures or unexpectedly causes the system to run low on memory, and you've ruled out memory leaks, perhaps malloc returning null.
Anyway this's old issue, sometimes before I had experienced thaat memory isuue with GG when minimized, and I should add that I've that issue just from time to time, not often.
I wonder myselft if for any chance it has something to do with 7018 error, since is too hard to find data, when all the blocks (chunks) are badly allocate, and you`ve a lot of memory block unusables, specially with virtual memory.
3com
Laptop: Lenovo - Intel(R) Celeron(R) CPU 1005M @ 1.90GHz
OS: Windows 10 (64) - Ram: 4 gb - Hd: 283 gb - Video card: Intel(R) HD Graphics