Earlier Dynas had two negative battery cables. Battery to a lug welded on left side of frame, then another cable from lug to starter (because of rubber mounted engine). My Dyna had symptoms like yours, and I found the lug was very rusty. I cleaned it and cable and starting was better. I now have a cable running directly from - battery to starter mounting bolt. I don't know if 2012 is like older models.
I'm a no hyphen (-) American.
Pete / Breeze .380