my 4th generation touch will not connect to the wi fi unless it is on the router 2 inches away it drops the connection have three other touches they work fine
You may try to reset your iPod by holding the Sleep/Wake button and the Home button at the same time.
You may check this support article too:
http://support.apple.com/kb/TS1398 - Troubleshooting Wi-Fi networks and connections
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