constant bluescreens

I've began having issues (slow playback, freezes, lags) especially with footage from external hard drives..

Began with this one:

So I checked and updated all the drivers (I thought it would be caused by an outdated graphics driver specifically).

Didn't really help.

I updated PP to the last version.. which helped temporarily.

Then I started getting this one:

So I did all kind of memory tests, everything returned a positive result (no issues found).

Then I got yet another one..

Overall, Premiere has been freezing often, loading (opening up a new project) extremely slow and giving me these blue screens when scrubbing through or rendering footage from external HDDs.

Any tips on where the problem lies ? I need to get it back running smoothly and in full speed ASAP!

Thanks!