MBP shuts itself down during sleep

My MBP shuts itself down durning sleep... or, stays black when I open the lid after sleep.  The hard drive is on,  but no key pressing will get it running.  I have to hold down the power button, til it clicks off; then press it again to boot up from scratch. 
Today, I booted up Console and under messages  found this:
7/28/12 4:56:21.519 PM Firewall: Stealth Mode connection attempt to UDP 192.168.254.1:64508 from 192.168.254.254:53
7/28/12 4:57:07.000 PM kernel: (default pager): [KERNEL]: ps_allocate_cluster - send HI_WAT_ALERT
7/28/12 4:57:07.000 PM kernel: macx_swapon SUCCESS
is this the signature of Trojan?
How do I correct this?

I'm having almost the same problem and I can't figure it out either. I put my computer to sleep and when I wake it up, the screen comes on with my full desktop, but everything is frozen. I can't open anything. I can't even force quit. I get no response from my mouse (other than being able to move it around- sometimes) and everything on the dock is unresponsive. I did disc repair– no problems reported. I repaired disc permissions– a few glitches, but all taken care of and okay. I restarted the computer, put it to sleep and same thing all over. Should I worry?

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