I have been getting a couple of issues that may be similar?

1. Game will freeze for a second, screen goes black for a second, then it resumes.

2. Game will crash and a Direct X 11 error occurred. (One condition for this, is that I must have waited in a DPS queue for at least 10-20 minutes before crashing).

I assumed both are related to SLI as I recently installed a 2nd GTX 970