i think its just programs using memory to run. like most mobile devices, claiming the memory back often needs a reboot.
seems having javascript in the browser turned on, is a major culprit as well, after a good browsing session, expect to lose between 10-15mb. thats if u can sit thru the appalling load time of the scripts. 4.2 browser with javascript enabled on GPRS is like a rocket ship compared to the bold.
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