Unexpected shutting down into sleep mode whilst using G5

i have had my G5 go to sleep on me several times whilst using in the last 2 weeks. It does not happen all the time. i have checked the sleep setting but these are OK.
any ideas what could be causing this?

Hi there,
check to see if your machine is on this list http://www.apple.com/support/imac/repairextensionprogram/ , if so that may explain the power issues you are currently experiencing... Rick
iMac G5 iSight 20" - 30G iPOD in Slimming Black -   Mac OS X (10.4.7)   - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620

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    Attachments:
    PowerHibernateNever.jpg ‏59 KB

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