Hi,
I don't believe it is a problem of the installed version.
Does the program provide you any specific info about the crash? It might be a problem with the repertoire and thus only happens once you reach a certain position. On the other hand I'm suprised that it keeps crashing after 5 minutes. The problem should occur always once you reached the position. Strange. Does it always happen even if you only train sub-repertoire A and after the crash only B? Or a complete different repertoire?
Another reason could be some external program like an anti-virus program which checks all network activities. It might cause some problems while CPT is saving the new training results. Just a wild guess.
Sorry to have no clear suggestion.
Regards,
Stefan