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Every time I turn on my M1 Max Mac I have to unplug and replug the HDMI but other than that the machine is a dream to use.

Same here on an M1. If you find a solution…

That's annoying but could also be caused by the monitor or TV HDMI implementation.

I don't think so. In that state, video will jump and stutter wildly, run very fast, and audio will be very broken. It's not just the sound that's affected.

Which all could be caused by a broken HDMI implementation (refresh, synchronization and audio are all encoded and synchronized). But of course I could be wrong and every M1 Mac has severe issues connecting to HDMI TV's.

Or it could be the cable.

For me, I have an M2 and no issues. Was worried about v1 issues (same for VisionPro—will wait until v2)

Tried a bunch of cables, including expensive ones. The only thing that solves this is rebooting the laptop.

I've tried a recent LG OLED, and a bunch of other TVs at friends and it happens every time if the laptop has been sleeping previously. If it's a fresh boot it never happens. That leads me to believe it's something on the laptop side.