I can't access my machine via ssh since I haven't a second machine to make a network. But I'll check if sound continues to play when X freezes.
I will also try some stuff I've read in different posts, as disabling apic and acpi. and also stuff like "NvAGP" "1" or "NvAGP" "0" or "NvAGP" "3". Maybe with luck.... I'll post the results when I've tried.
WaxyLemon> I think we have the same problem. I'll post in this thread and in yours anything that could help