Sounds like a great sled ... the older "F" series had a starter "issue" The starter was back behind the engine and there was a flexible cable to the fly wheel to start it. That cable would break and start spinning, often right into the oil container. The new ones like yours and my 2016 800 el tigree have the starter in close to the main and secondary clutches. The starter tries too start but too slow. Sounds like a bad battery. The starter is getting swamped or caked with dirt from the clutches and belt. Every 1.000 miles i clean it.
Jack the right side of the sled up a bit to help junk to flow out of the sled. Spray the starter with carb or brake cleaner, let it drain then spray in some oil. Start it a couple times and its good for another 1,500 miles give or take.