Thanks guys.

For some reason it seems to have fixed itself, I'm now up and running for about 10 Minutes with moderate usage and everything worked.

I did indeed get those dyld messages, although normally it would appear in a kernel panic
Anyway, I've used the command in Terminal just to make sure...

I think it must have something to do with bad caches or something like that as it very reliably occurred after about a week of usage twice now.

I'm gonna report back whether or not it happens again.

UPDATE:

System has been running stable for about 12 hours now.