On my office computer with Windows 7 Pro, I have mapped a network drive to a folder on my network attached storage device (Intel ss4000-E). Several months ago, the mapped network drive began to disconnect at regular intervals (don't know the duration). The mapped drive displays a red X in Windows Explorer. If I click on the mapped drive entry, the contents of the mapped folder displays and the red X disappears. But after some interval, it disconnects and the red X once again appears. About a year before this started happening, I would have trouble connecting to the NAS; sometimes I have to hard-boot it a couple of times before I can connect to it. But once connected, the connection is stable. My backup routine which is scheduled to run at 6:00 P.M. fails because it "failed to open the data stream" (I'm assuming it's because the mapped drive has disconnected). I have tweaked the registry settings for "lanmanserver autodisconnect" and "lanmanworkstation keepconn" to no avail. I have turned off power management in the wireless network adapter settings on the office computer. There are no settings in the NAS control panel to affect this. I have set LAN Manager authentication level to "Send LM & NTLM - use NTLMv2 session security if negotiated" as suggested in one post. I've tried all the suggestions an extensive internet search has turned up and nothing works in my situation. Any help?