I handed over my 19 to the dealer last week to have them look at sumping issues. Interestingly, I can (somewhat) consistently reproduce the problem. Read on if you're interested.
Attached is a map of a portion of La Crosse County, WI. Position #1 is at the top of a bluff at the mouth of County Road FO, which has some nice corners to carve, and which loses about 460 feet of elevation by the time you get to position #2, roughly 2 miles down the hill. After attacking the corners in a very spirited way, I slow down to highway speed at position #2 and and by position #3, roughly another 2 miles down the road, the bike exhibits power loss and high heat, which I assume is sumping. I stop at position #4, a golf course, to let the bike idle and it clears up in 5 minutes or so.
About 350 of the 460 feet of the elevation drop occurs in the first 3000 feet of road between #1 and #2.
I've had this happen 3 or 4 times, always in the same spot and in the same manner. But the bike has never exhibited this behavior anywhere else and at no other time during the 5k miles I put on this year.
So I explain this to the dealer and I'm waiting for them to let me know what they're going to do. I want them to give me the 2020 pump. We shall see.