PES 2010 framerate issues

[Cheeky_Ash]

Guys,

Can you help? Ever since I've upgraded to the latest pes patch v1.05 (patch 1.03) I think a few weeks ago I've had real framerate stutter issues with PES 2010 on the PS3 online and offline, which gives me a huge disadvantage when gaming. I'm not getting any problems with other games or BD/DVD's?

Setup: -

PS3 - Slim and 60Gb variants tried.
High spec HDMI lead.
Panasonic Viera TX-32LDZ80 (1 year old).
Display setup HDMI - 576p, 720p, 1080p, and tried automatic as well.

Things I've tried: -

Different HDMI lead - no change.
Selling my old 60Gb PS3 for a new 250Gb Slim - No Change.
Messing with the settings of TV - so least processing - No Change.
Swapping old PES 2010 disc for new PES 2010 disc - No Change.
Changing to Standard AVI/Scart leads from HDMI -Improvement, but picture looks rubbish!

This is driving me nuts as I've been playing ISS/PES since 1996 and consider myself as a good player but online in particular I lose just about every game because of this problem - does anyone else have the same problems...or know of a solution?

Thanks,
Ash