Ok, did it work in the past? When did this start?
Ideas, in no particular order:
Try rendering something, anything, that isn’t rd3 to get that out of the picture.
Try reinstalling premiere.
Have you tried rendering both in premiere and AME?
Try removing any effects and just render the clips without any effects?
Try making a new project, import some of the clips, put them in a timeline and render.
The freezing has always been a problem in Premiere Pro. There’s always been a problem of inconsistency as well. I had a different project before. The sequence was a 10 minute r3d sequence. One time I rendered and exported it at high quality and it worked, other times it would stop part way through.
From what I understand, it isn’t necessary to render the sequence if you just want to export to a different file format. Am I wrong with saying this? I thought rendering is for previewing the sequence.