One thing about WiFi, If you try to use or do something that does not go through WiFi like corporate email or BBM that is via a corporate BES or BIS servers, the bb will switch back to cell data and shut off WiFi you then will have to manually turn it back on sometimes.
The BB should re-connect after a while to the WiFi. thats the only thing I can think of.
do you have any Apps that may be interfering?
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Z10 on BES