I've similar issue times ago, with model coming from max, anyway nor max or gg issue, but my fault, I had missed some model hidden, so GG show me it from time to time, depending of the angle of view.
Whe you import model from max to X file, if you've ticked export hidden items, so you'll get the issue.
Does you try importing from Fragmotion?
Does you try Mender?
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