Yup. Happens to me on 3 out of every 5 pitches, not just fastballs. I’m on Xbox series S using an elite series 2 controller. My PCI is also extremely jerky/choppy. Miserable experience playing online, the PCI is whatever but it’s impossible to pitch when it cuts off halfway.
This has apparently been an issue for over a year, so don’t expect any fixes. It’s a shame