I've been crashing during editing trying to edit the GoPro 11 8x7 format and somewhat editing 5.3K format in general. Setting my Dynamic RAM Preview back to 5% fixed my rendering freezes, but I'm still crashing every 5 minutes today with 4K-60 that has been cropped to either 9x16 or 16x9 (portrait) from a 3840x3360 image. Trying to use the trimmer is just about impossible without it crashing. All my settings in Vegas are default except for unchecking Legacy HVEC under File I/O.
The reason I question whether it's the 8x7 format image is because I have few issues with 4K-30 recorded in a standard 9x16 format (3840x2160p). It may be my GPU just isn't up to handling this increased demand (at 60 FPS) and it's not an issue with Vegas.
Intel i7 - 7700 (32GB RAM) - Nvidia 1070 graphics card - Windows 11.