Average Performance Load Issues

I’ve got a particular track which has this crazy avg perf load issue. It just sits at about 75% on loading the track and then rapidly goes up to 100%

I’ve done everything including bouncing it down to stems and re importing as a new project and the same issue still comes up! Other tracks on my system work fine, just this one will eventually peak and stop playing… Just at the mixing phase now, increased sample size to as big as it can go and it still is an issue. Any ideas ?

Am on Cubase 10 with Focusrite Saffire 6 usb, Win 7 (yes I know, I’m getting off it soon!), I7-2600 with 16GB Ram