Hello...I am having the exact same issue with my new 2021 Giant Fastroad E+ EX Pro. The shop is offering a full refund, or swapping it out for a Trek Allant+ 7s. After reading this thread, I think I am going to jump ship. I also own a 2021 Explore E+ 2 and Roam E+ 4 GTS, and neither of these bikes have ever had a problem...so I suspect there is a design flaw with these bikes. This should not be happening, and it doesn't bode well for years of trouble free riding.