Ipod touch connecté à la wifi mais pas de réseau

Bonjour,
J'ai un ipod touch 4ème génération qui à un peu plus d'un an, mon problème vient du réseau. En effet je n'ai jamais eu de problème pendant un an, pourtant depuis un mois je ne peux pas aller sur une page internet ou même utiliser n'importe quoi concernant internet. Je ne me rappelle pas avoir fais quelque chose empêchant la connexion....
Ce qui se passe c'est que lorsque j'entre ma clé WEP(sans oublier d'appuyer sur le bouton d'association), la connexion à ma livebox a lieu (je vois le voyant en haut à gauche avec les barres m'indiquant que j'ai du réseau) par contre je ne peux pas accéder à internet.
La wifi marche sur mon blackberry et de plus le problème vient du lien entre ma livebox et mon ipod puisque quand je connecte mon ipod via d'autres réseaux wi-fi ou partage ça marche sans problème.
Je me demande bien ce qui cloche surtout que j'utilisais très souvent mon ipod avec internet donc ça m'embête beaucoup.
Quelqu'un a eut le même problème ou connait une solution?

See:
iOS: Troubleshooting Wi-Fi networks and connections
and the part of the following concerning using WEP encryption
iOS: Recommended settings for Wi-Fi routers and access points

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