Volume turns down on its own

Hi,
I have a weird problem with my wife's iMac Dual Core.
The volume has started turning itself down to zero after a short while of use, leaving the Speaker < ))) indicator display on screen, but with no volume indicated.
If I use the menu bar volume at the top right to increase it, it immediately decreases back to zero.
If I do a reboot and go back in again, it seem to fix for a short time, but. the decreases down again.
I suspect its something to do with the keyboard Vol down button bring stuck in some way on the (wireless) UK Keyboard we use, but the Keyboard Viewer does not show these keys so cant tell its its being "pressed"... Another reason for suspecting its a "stuck" key is that it does it in a click-click-click tempo (decreasing) similar if not identical to the keyboard repeat interval.
The weirdest bit is that the volume keys and controls work normally after reboot... for a short while...
No other keys appear to be affected, and the rest of the system appears to be working fine.
Thanks in advance for any guidance...
Martin
Hardware Overview:
Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B09
SMC Version: 1.9f4
AppleWirelessKeyboard:
Name: AppleWirelessKeyboard
Address: 00-0a-95-xx-xx-xx
Type: Keyboard
Services: Apple Wireless Keyboard
Paired: Yes
Favorite: No
Connected: Yes

Greetings from Mexico!
So glad to run into your post as I have a similar problem: the volume up key appears to be randomly stuck, such that every now and then, on its own, it will go all the way up to the highest setting and remain there. The gray volume indicator persists on my screen, and the only way to make it disappear is to reboot the computer.
I attempted your solution and the problem seemed to go away and now it's back. Since the file you mentioned is gone...
com.apple.soundpref.plist
... I don't know where else to tinker.
Curiously, if I disconnect my USB keyboard, the problem goes away, but it manifests itself so randomly I seriously doubt it's a hardware problem.
Left to try is borrowing a keyboard from office and replacing it, but I hope somebody on this forum has a good answer.
Regards,
Paco Ojeda
Puerto Vallarta, Mexico

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