“Rendering Device Lost!” with RTX Graphics Cards
There was previously a semi-common problem with RTX graphics cards receiving this error message, however the issue has since been resolved with the latest Nvidia Geforce drivers. Before troubleshooting your individual Rendering Device Lost error, try updating your drivers as mentioned in this post.
If updating the drivers does not fix your issue, then the problem is unrelated to the previous bug between RTX cards and Overwatch. Please feel free to use the rest of the troubleshooting steps on this article for more help. Keep in mind that not all RTX users will have this problem and there are multiple causes for the Rendering Device Lost error.