Mac mini won't wake from network

Hi, I am confused and need some help.
SInce upgrading to 10.7.2 my mac mini no longer wakes for network access i.e. from ATV2. Worked perfectly before and now it does not.
Also, the screen shows (about once a week) snow on the screen from a wake from sleep. only a reboot solves this.
Any thoughts?

My Mac Mini server (2011) with 10.7.2 has the same problem since 10.7.2 update.

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