I had this problem with my 2016 K900 Luxury w/VIP Ultra option (Mineral Silver with Black interior), and after a new battery (9/18)I thought it was put to bed. A little over three months later (2/18), I had another no-start, which couldn't have happened a worse time, with no warning at all - no slow starts, nothing to give me a clue I was about to be stranded. I had a hard time even getting into the car, which required prying off the cover on the door handle to use the key, opening the hood, and had another rough time getting the cover off over the jumper connectors - the plastic hold-down pins went flying everywhere. After finally getting it jump-started, I took it to the dealer who kept the car for a week. No problem found! Water was also found to be standing in the wheel well, and they did everything they could to see if it was leaking but couldn't find the source. The dealer had no idea why it was happening - I feel it was moisture condensing on the spare tire rim, as I had seen that upon checking. I also found mold growing on the underside of the spare tire cover. That was the clincher for me. As much as I loved driving this car, with all of its quiet, comfort, and features, I just couldn't deal with the possibility of being stranded any longer.