It can never hurt to install the latest update to Sony Vegas. The current release is Version 13.0 (Build 453) 64-bit. In Vegas, you can find this information under Help | About Vegas Pro.
However, I doubt this will fix your issues. Most of the time when I investigate Vegas crashes on customer computers, they are usually caused by outdated video drivers or even selecting the wrong video card under GPU Acceleration within Vegas. Many times, this is due to updating to Windows 10 but not installing the latest drivers for the new operating system.
I had one customer swear they hadn't changed anything but when I jumped on their computer, they'd updated to Windows 10. "Oh, that change, yeah I forgot I'd changed the entire computer."
Try turning GPU Acceleration off. If this helps, update your video drivers.
Close TandemVids
Open Vegas on it's own
Options | Preferences | Video
Under GPU Acceleration of video processing, select Off.
Mick