I had Opus debug my laptop restarts. It pulled down windebug and pointed out the two drivers that were causing a problem.

One of them was an HDMI audio driver, which wasn't completely a surprise given I connect to a KVM and I imagine something was weird about the connection (and I don't listen to audio through my monitor anyway)

The other was the realtek/intel driver for audio as well? (updated those) Never have had a problem again. Felt pretty good. Windows laptops are pretty awful about coming out of power save, but works like a champ now.