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wifi problem

my Inspiron 13-552 can not connect after i change my password, even the password is right. and it can not connect with in the router after a long period of time e.g. (when i forgot to connect it for 1 hr after changing my password). the only solution i can find is to restart or shut it down again. does any body knows how to fix without restarting or shutting it down? 

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