PS3 Fails to play HD content midstream

[ImPulSive]

I am using a PS3 to play back HD content I record with my iMac and HDHomerun HD tuners using EyeTV. The files are saved on my iMac as MPEG-2 and are shared to my network. The iMac and PS3 are connected to D-Link 2205 Gigabit switches and all wiring is cat 5e. The iMac is 1000/100/10 and it is my understanding that the PS3 is the same. I should only need 100 Mbit to stream a single HD video at a time so the 1000 is overkill. The PS3 finds the iMac share ok and plays the video ok but it suddenly breaks midstream with an error about bad stream or end of stream? (Did not write it down.) At this point I am stuck and have to press the back button on the PS3. If I play again I can fast forward past this trouble spot and play ok but it will crash at another location later on. The files play ok on the iMac. What is the problem? Is there a setting on my iMac or PS3 I could use to get around this?

TIA...