I purchased a 2021 Trek Rail 7 in Aug 2020 knowing that Bosch planned an update for the bike's Gen 4 Performance Line CX motor which increases torque from 75 to 85 nm. I had fun riding during August and September, then returned the bike for the software upgrade through the dealer only to find that my bike stutters in Turbo now. By "stutter" I mean that the power pulses through the pedal stroke - turning on and off - and the speed indicator goes wacky displaying 14 mph one sec and 19 mph the next then back again. I use Turbo mode when pedaling on the paved roads to my trail area and this stutter is both annoying and unsafe. I brought the bike back to my Trek dealer and they verified that the the software upgrade was correct (it's Performance Line CX 188.8.131.52). They sent me home with my faulty bike and said they would investigate with Trek and Bosch. I used the bike for only a few more weeks last Fall before hanging it up for the Winter, and never heard back from the dealer. Fast forward to today and I picked up my bike from the dealer after a spring tune up, and it has the same problem - it still stutters at higher speeds in Turbo. The "low IQ" service rep said, "Yeah, all the Trek Rails do that". I've now left the bike with the dealer while they contact Trek and Bosch again, but I don't have confidence they'll figure out what is wrong. I know from reading this forum that a "stutter" in the pedal stroke may have something to do with a problem with the torque sensor. What's weird to me is that my new bike worked fine before the Gen 4 software update adding more torque. Anyone else have this problem or suggestions about how to fix it?