I've never had a reliability issue with Vaultwarden. Hosted it 5+ years now. Even with random off/on of the server and other bumps in the road in life, the Docker container I run has had no issues with hosting. The user interface is friendly but can be just a little slow.

Mine is not exposed to the public internet, though some friends of mine do. I use a VPN when I need to access fresh data from the home server, otherwise both the Firefox client and Android client will generally keep a cache of the last data pull when they had connection (so it wasn't an issue the 4 or so years I didn't have a VPN yet).