https://bugs.winehq.org/show_bug.cgi?id=53227
--- Comment #3 from Eric Pouech eric.pouech@gmail.com --- that could explain.
this in fact opens two several questions: 1) how to make sure windows update doesn't interfere with the tests? 2) how to upgrade the snapshots...
1) we could either disable once for all Windows update or let winetest/testbot (not sure which) disable the update service while running the tests (it could even be a better idea to disable more services) 2) this requires a dedicated process, not run when a test is run, for upgrading the snapshot.
but for the stability of the tests, it's also a bad idea to let the snapshot be upgraded without testing what has changed (IMO, this could even be covered by a different snapshot name as we're testing something different)