Fedora 7 freezes two or three times per day

[Langdon Stevenson]

My Fedora 7 system is running well, except for the nasty habit of 
freezing two or three times per day when I am working.  First: all 
windows stop responding to the mouse and key board, then soon after, the 
mouse freezes as well.

The only option available then is to press the reset button to reboot 
the system.

There doesn't appear to be any specific application that causes the 
freeze.  It typically happens when I have a largish number of 
applications open at once (say: Firefox, Eclipse, Thunderbird, Pidgin, 
Terminal, Putty), but I could be working in any one of the applications.

This problem has been happening since I installed F7 soon after the 
official release.  So I have seen this behavior with at least three 
kernels (including the last release a few days ago).

My system spec:

- CPU: Intel Core 2 Duo e6600
- Motherboard: Gigabyte GA-965P-DQ6
- Video card: Asus EN7900GS
- kernel.x86_64 2.6.21-1.3228

All currently available F7 updates installed.

Are there any known issues that may be causing this?  If not, should I 
be reporting it as a bug?

Regards,
Langdon