Mine does the same - more so the colder it is. It's not so much metal grinding sound a s loud groan. Does it for first or second start-off (unless I slip it a lot) and that's it until the next real cold start...
I've taken the plates out, re-oiled them (let them sit overnight in oil) and re-installed - it helped, but still does it on really cold mornings.
It is colder in Canada than in the winter.