Of the three, I've only seen Primer. I must now kick myself
because I attempt to watch EVERY time travel movie I can, thanks
to a life-long appreciate of Doctor Who, and having had to live
between the 15 year gap inbetween classic and new series.
[I filled my brain up with SO MANY AWFUL Time Travel stories,
but it was my fix, the methadone to my heroine addiction]
Yet a few were very good. Primer was one of them.
In a single word, what did these have in common based upon what
you've said and my own viewing of Primer? Psychosis