Unfortunately still the problem since Vegas Pro14:
Sporatic crashes in real-time preview when GPU support is enabled.
My laptop: MSI GT80S 6QD (2x Nvidia GeForce GTX970M) with Win10
Material: mp4 FullHD 60p with 50MBits of the Panasonic AG-UX180

I hope Magix can solve the problem someday.
With every update I hope - but nothing there. Magix does not get it under control :-(