I too am experiencing this problem i think. The worst thing it is so hard to find the cause as on reboot it works.
One behaviour i have as part of this problem, is that in the background the iMon software for the remote closes precisely at the timeout when the pc should standby.
One behaviour i have as part of this problem, is that in the background the iMon software for the remote closes precisely at the timeout when the pc should standby.