I've had to go back to 27.1.1 as I found a few major issues with 27.1.3. for me, 27.1.3 would run fine on boot up, provided I didn't close OBS and restart it. that's when the frame rendering issues and frame drops started. only cured by a complete shut down (not a reboot - a full shutdown) and restart. After endless trial and error, I just decided to go back to 27.1.1 and all is well.