Frequent Crashes in Ubuntu 9.04

[Storm Dragon]

Hi,
I am having this problem with 9.04.  It starts up, Orca starts and gives
its little shpill about the desktop, but now for some reason, half the
time it says frame greyed.  Then, a few minutes later, it crashes, the
whole computer crashes to the point where the only way to get it working
again is to hold down the power button and do a hard reboot.  Is anyone
else having this problem?  Is there anyone else experiencing this issue?
If so, is there a way around it?
thanks
Storm
Check out the Storm Dragon blog: 
                       http://www.stormdragon.us/

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