Does MMR reset after a few weeks of no ranked/gameplay?

On one of my accounts that's currently gold 3, I haven't played in about 3-4 weeks.. and with a 64% winrate I expected to come back and get the whole "forced 50% winrate" nonsense for like 20 games til I can start climbing again.. but I've had nothing but the absolute most insanely easy freaking matches, practically like im against bots, and with more enemy trolls than I've ever seen.

Is that account just blessed by the matchmaking gods, or did the MMR reset or something?..

tl;dr DOES MMR reset after a few weeks of no play?