Video Hangs When Resuming Playback

I often watch long YouTube videos over the course of several days. By “watch,” I mean that I upload an MP3 and then sync it to YouTube. Each time I return to resume the video (for example, on the second day), the video fails to load on the first attempt and appears to hang.

Reloading the page and manually skipping ahead to where I left off resolves the issue, but it would be much more convenient if the video loaded correctly on the first attempt. Attached is a screenshot showing the video in its stalled state.