Why are my AirTags suddenly disconnected and chiming?

Airtags are suddenly chiming for no good reason. This chiming made me open FindMy but no Airtags are connected. All my Airtags stopped being seen 2 weeks ago, why does this happen? Both my Macbook and iPhone are often in close proximity. This happened a few months ago too, but after being unable to fix it after a few weeks they suddenly reappeared. Is this system just not robust enough to be consistent? Any way to fix it? It's kind of useless if they are unreliable.

[Re-Titled by Moderator]

Original Title: Airtags all got disconnected