HP 7520 loses wi-fi connection. What can I do?

I have seen a lot of talk about HP products losing wireless connection.  I am having the same problem with my 7520.  Initial setup went perfect, but it started losing the connection when it went to sleep mode.  Anyone have a solution??
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Set the printer to a static IP outside the range of the DHCP in the router.  Use a fixed channel, never 'auto'.  Use WPA2-AES for yhour encryption.  Now try.
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    Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
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