Cubase starts glitching after about 40 minutes?

Hi I have noticed lately that cubase is starting to glitch and the cpu usage is really high after about 40 minutes of using it, all I’m doing is recording audio takes or messing with EQ
I’m on cubase 10 latest build, high sierra Mac 4.0hz 32mb ram.
I do have cubase 10.5 but it crashes with Fabfilter if I open two instances so I can’t use it

not had issue before like this as far as I am aware
any ideas how I can clear the memory would it be the undo history filling it up? I have set o 100 limit


You need at least 4gb ram… you can’t run cubase on 32mb ram!

32gb that was meant to be