Comment 1 for bug 1855489

I'm not aware of such a feature (auto-restart).

Did you mean auto-update? The snap will indeed automatically update in the background, which may cause some issues if the app is already running. This is being tracked by bug #1616650, and I suggest you try setting the experimental.refresh-app-awareness flag to true (see https://forum.snapcraft.io/t/wip-refresh-app-awareness/10736).

If chromium restarts under your feet while you're using it, that's probably a crash, and I'd be interested in steps you take to reproduce it.