Video will glitch and restart to beginning of file while audio plays normally

Hello,

I'm having an enormous issue with Premiere Pro right now where the video will occasionally glitch out and reset itself back to the first frame. The audio will play normally, following the ins and outs on each clip. The video however just decides to play from frame 0. There's not a consistent point where it happens across different videos, but it happens consistently within one file. I've loaded the clip in VLC and it plays back normally.

The footage I'm editing is HEVC shot on an iPhone 11. I've tried resetting preferences, deleting media cache, deleting render files, all the usual tricks. This bug is a huge time waster for me, please someone help me 🙂

This seems to only happen on Premiere for Windows. My other editors edit on Mac and don't have the same issue, but both of our Windows machines are affected by this bug.