Overwatch is Crashing, repeatedly

So, I just got a new graphics card, which has allowed me to play on epic quality of almost any game, but ever since, my game has been crashing a lot, especially when I play competitive, making it so I lose SR, I even lost connection 3 times in one game, but I could still rejoin. So I looked it up, and most of what I could find was only that I should turn down my quality settings, so I went down to medium graphics, yet the problem persists, and is even getting worse, to the point where I don’t want to play Overwatch anymore. I have no idea what to do. Any suggestions?

Can you please elaborate any error codes you are getting? If " Your Rendering Device Has Been Lost", please check this topic first: