sounds like it could do with a full reset.
http://www.hard-reset.com/samsung-galaxy-tab-gt-p1000-hard-reset.htmlif that fails then go to the play store and download the samsung kies app. then also install the samsung kies program onto your laptop or computer. link the p1000 to the computer and see if there is an available update for the software.
samsung have said they did release one, the device when it came out was running on the FROYO software, and im sure they have a update to the jellybean but thats as far as they are going with this device
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