Another alarm problem

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I am continuing to have problems with the built in alarms on my xda exec. I initially had problems with the alarm not switching off which sorted itself although I am not sure how, and all was well for a time. Now when my alarm sounds it vibrates once but doesn' sound the alarm. I have pocketzen phone so have tried with this off but no success. My sounds and notifications are all ticked.
Does anyone have any ideas what else I could try?

Also does anyone know of any 3rd party alarm, pref freeware, which I can try instead?

I have the same experiences w/ my Dopod 900