>>Wireless speed will not be a factor. RDP works very well with a 0.5Mbps connection. However, wireless reliability might be an issue. Maybe there is some kind of interference. Do network operations other than RDP on the ultrabook (Web browsing etc.) seem to be reliable?
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>On the ultrabook, everything works perfectly.
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>Today, I find that all has been ok so far. I am starting to think that maybe the FiberOp Internet provider pushed a firmware upgrade in the FiberOp router which might have been the cause of all this. This would then assume they would have pushed an upgrade this morning.
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>>I'd suggest a test using a cable for the ultrabook networking but some of them don't have a cabled Ethernet jack, you'd need to use a USB Ethernet adapter.
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>Yes, that is exactly the problem.
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>>You could check the Windows event logs (System, Application) on both machines to see if there are any clues there.
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>Thanks, I will check that.

You might want to contact your ISP about router firmware updates - what is their policy, and what update(s) have they applied recently. Personally, I would not allow an ISP to push out firmware updates without notification. Many times updates like that destroy any custom settings you may have in the router such as port forwarding etc. Also your service will be interrupted during the firmware update process.

Right about now is the time that this month's Patch Tuesday Windows updates are being applied. So, if you've noticed that things are better today than yesterday, maybe it's because of this month's Windows updates, rather than a router update.