Iskuu

So I've been using MCC for a long time now, I've noticed very recently, it's started to get progressively 'slower' as a mission goes on and slows down the entire game, both with mods and without. I click MCC to bring up the menu and it'll take anywhere from 30 seconds to a minute and then will lag out and auto close, occasionally it does it with Zeus too, lags out and loads 3 lots of Zeus then resets. (This only happens when MCC is loaded as a mod), anyone else experiencing this?