Some things to try. Did you add any Apps? Did it get wet? If you did add any new apps then try deleting them one at a time to see if it clears, Also if you got it wet or very damp you may need to dry it out.
Pull the battery and put it in a bag of new ( dry) rice for a few days. It will absorb the moisture and should help. Last thing, return it for a warrantee replacement.
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Z10 on BES
Z10 on BIS
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