Don't panic It just means that you have a fast connection & aren't firewalled...the network needed more UPs & it chose you! The process is automatic. It's not a new thing. Sometimes mine loses connection for a sec when switching to UP & sometimes not. You should be able to resume that download from your incompletes.

If you don't want to connect as an UP tools > options > speed. Tick 'disable UP capabilities' & apply. Now you'll stay a leaf.