TS1398 imac connects to internet for a few mins then stops and cannot find any wifi network-other devices are connecting without problems

My imac has suddenly stopped connecting to the internet through my wifi network if I restart the machine it finds the network for a minute or 2 and then stops working and cant find any wifi networks, other devices are connecting with no problems. Any suggestions please

Try posting in the iMac forum. This is the iPod touch forum.

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