Error copying file or folder

hi guys, im having issues with this error file and folder. im trying to transfer files to WD essential storage using wdtv live n router netgear dg834g. but recently the past week im starting to get these error message which states "error copying file or folder" cannot copy ... the specified network name is no longer available. never had any problems for a year n just started about a week ago. i have rebooted router , wdtv , storage to no avail. any ideas.
 
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