Load latest VIA drivers - see drivers section. AGP - be aware that the AGP slot shares an interrupt with PCI slot 1, so try moving any card out of PCI slot 1. This may also be due to sharing of hardware IRQ's by a pair of PCI cards. Another user reports that ACPI appeared to be the cause of this. This appears to be an issue with a variety of graphics card owners, including G400, GeForce and Voodoo 3000 owners.
System now enters sleep mode and awakens normally without hanging.
My system hangs with my network card. This may typically occur when the network card is in PCI slot 2 and the sound card is in PCI slot 3. See the question below on how to avoid IRQ conflicts. Firstly, if your system is functioning correctly but you have shared interrupts, don't worry. You need to nothing, the system is working as it is meant to.