We're running an internal migration of all old players' stats to our new highly advanced statistics tracking backend. This means that stat changes will be a bit delayed while we ingest this huge backlog of data. Nothing is being lost, it'll just take a bit longer to show up in the in-game UIs.
Maybe it has something to do with the new matchmaking system? Perhaps it's buggy so some players can't join.
Also gamemode selection for BlockWars Giga is so useful!