Cubase crashes when opening projects

Hey guys, I’m looking for some help.

I’ve been a Cubase user for several years and I can’t really remember when my problem started, only that it’s been a recurrent problem for years.
I’m a guitarist so I often practice several songs/solos in one session which means I often open different Cubase projects in the same session. Problem is, I’m lucky if I can open more than two projects in a row without Cubase crashing. So my question is what might cause this problem. The projects I’m practicing over and open frequently are at times mere backing tracks for solos, so no heaving lifting loading them.
I never have several projects open at once, and it’s not like I’m opening and closing them all willy nilly, but maybe a new project every half hour to an hour or so.
This is both my fourth computer and fourth operating system where this problem have occurred (win 7, 8, 10 and mac os).
I’ve never had this problem with any other DAW, and I’ve opened way heavier projects more frequently in other DAWs without problems.

Current specs:
Win 7 64 bit
Cubase Elements 8 64 bit
Intel i7-6700k 4 GHz
750 GB storage SSD only
Line 6 GX external audio card

Help is much appreciated, thanks.