Originally Posted by Koyote

Which drivetrains? If Shimano 11sp, I recommend that, at minimum, you replace the RD cables. They really do go quickly -- you'll notice a couple times that you 'click' the shifter and nothing happens, and then...You're single-speeding. I've gotten as little as 1500 miles out of a cable. It's not a Koyote problem -- it's a known issue. Pops up in threads here on bf all the time.