mchain
4
Depending in what part of the world you live in, vps (main) updates are rolled out at different times, and sometimes no vps is issued for that day. More main vps are sent out if needed, depends on how busy the malware front is atm, or, if the secondary or third are just fixes for detection errors in the first daily vps issued.
Helpful to know version and product of avast! or whether an upgrade from older version or clean fresh install, as SafeSurf suggests.