What you are doing is illegal. You cannot connect to your neighbors internet without there permission and the permission of there ISP (they could get charged for providing ISP services for free etc.) So, sorry I can't really help you do things that are illegal.

In brief, you are porbably being disconnected due to a low signal. At the cafe, you probably do not have there correct settings as far as connecting goes, leeching there will get your IP/MAC banned if they find out.

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