>>Do you have the adapter plugged into a USB3 port? Those can supply more current/power than USB2. The adapter may require the extra power that USB3 provides.
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>In here, you will find the specifications:
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>http://www.laptopmag.com/reviews/laptops/sony-vaio-duo-13
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>This is USB 3.0.
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>>Even if you don't think the power plan in effect powers down the adapter, you probably should still disable power saving for it in Device Manager.
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>I can't find the option for that.

If you go into the Properties of the adapter in Device Manager, typically there's a "Power Management" tab with various options.

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>>If the above doesn't fix it the next step is to see if you get disconnects every 4 hours "like clockwork" or if it's random but roughly 4 hours. If it's like clockwork, note the time(s) it happens. You can then look for scheduled tasks either on your workstation or on the network that might be causing the problem.
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>Ok, thanks
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>>Also, knowing if you're getting completely disconnected, or just partially (can still see some hosts/printers etc.) can be useful for troubleshooting.
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>The network icon is removed when it happens. So, that would be a full disconnect.