Yes, I bought my 2019 GT in Feb and they delivered it to my house. I took it out the next day for the first ride and it died on me a couple of times. Then it started throwing errors and was acting funny. I called and had them pick it up and take it back - they went through and reset everything, thinking that they just needed to clear the errors and life would go on. They dropped it off a few days later thinking it was fixed. I started it and it seemed to work fine. Then I was going to take it out for a ride the next day with my brother, but the bike was completely dead - no "Ready to Race" or any other signs of life. I took it to a closer dealer thinking I might have a fuse issue (didn't see anything) or something similar that they might be able to fix. No luck. So they kept it and went through a lot of diagnostics with KTM and eventually pinned it down to the same switch you mentioned - the grey button. They said they thought a wire had been damaged during shipping or something. Now however hearing that others have had this issue makes me think it's a defect. All I know is I was unable to ride my bike for over a month while all this went on and then waiting for the part to come in. The good news is my local dealer has good mechanics and only focus on KTM.