I have produced 100's of videos before. Today after editing for 12 hours I render a new video and it first is audio crackles, then the video freezes but the audio keeps playing? My computer is optimized for Audio and Video production. There is nothing different about this project. It is simple. A live recording of me and then I add pictures using a second track. Rendering is using MAGIX HEVC/AAC MP4 HD 1080p 29.97 NVENC just like its always been. Project plays just fine with no glitches.
I updated my NVIDIA Ge Force RTX 3060 just to see if that was it, nope.
My Motu M4 audio driver is up to date. Windows is up to date. I made a video yesterday no problem? so what is it that can cause a project to go south and how can I salvage 12 hours of work?