General Notification tone disappears

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http://androidforums.com – Hi, hope you can assist with this annoying issue.... I tend to leave Galaxy Ace mob switched on for several days at a time (use it as an alarm clock) obviously recharging when required. However, after some time the text/notification tones are replaced by a single pulse type tone, which you can bearly hear. I go into SOUNDS on settings and attempt to change it, but you don't get the "sample" of the new tone selected, just the single pulse tone. This also happens on the ring tones. When I receive a call though, the phone rings with the correct pre-selected tone. :confused: Task (General)