I upgraded my PC recently and have gone from 1920x1080 display to 2560 x 1440 display, along with a better CPU & GPU. Previous to this I struggled to complete the majority of US freight services without derailing and frequently derailed on DRA as well. Since the upgrade Ive had just 1 single derail which was on DRA and was completely my own fault, it was the BR talent and I was overspeeding on a curve and hit the indirect brake into max so I think we can discount that one. It might just be a co-incidence but I thought Id mention it incase it helps the team pin point the bug.