GTA IV Freezing on PlayStation 3?

My PS3 froze while playing GTA IV Collectors Edition and it now won't read discs. I've got to send it away and wait at least 3 weeks before they return it.

Downloaded PS HOME now problems with freezing and sounds with GTA IV (regular addition) on PS3 40G ---- 1-8-09

@hyperkane Did you get anywhere with this? Mine started freezing up at random intervals. Have reinstalled, reformatted the console, bought a new copy of the game and nothing works. Onlly suggestion on the rockstar site is to disable network, turn of auto-save, turn off controller vibration, lower graphic details - so what's the point in having the game. Sony can't help as it plays all other media and games fine...oddly mine started in April this year as well....was there a PS3 update about then?