[DCP-o-matic] Help diagnosing faulty DCP?

Hi all. Anyone out there have access to a Wailua or recent version of EasyDCP Player+, and be willing to run a DCP through it for validation? This DCP is a 3 minute short which failed playback at a London cinema recently. The fault was that picture and sound cut out (screen black, silence) for a couple of seconds and then playback resumed, but it skipped forwards by about 1 minute. This behaviour was replicated on two different servers at this cinema, although weirdly it played back faultlessly at another cinema. The disturbing thing is that I cannot find any fault with the DCP with the tools I have available. I would really like to find out what the fault is so I can add tools to our workflow to catch similar faults in future. NB This DCP came from an unknown external source and was made with OpenDCP. However, we rewrapped it with DCP-o-matic (without force J2K re-encode) and the problem persisted in that rewrapped DCP. If anyone is able to help, would be amazing. Many thanks, Jim