Dell XPS 15 9550 Thunderbolt and Fan Speed

Downloaded the newest Thunderbolt driver this morning. It MAYBE fixed the occasional outage problem that many are having with Thunderbolt/USB-C port adapters - jury is still out on that.

Here is what it DID NOT FIX: The fan speed. No matter what I plug in to that port, the fan revs up and stays up. 

I disconnect all USB-C adapters and revert to my USB 3.0 equivalents and everything works fine. I have a 3.0 LAN/Gigabit port and a Plugable 3.0 to HDMI adapter that are working great with no fan revving.

The minute I use my USB-C versions, that fan gets spinning. Why? Watching my Task Manager, I can see 1-4% CPU, 20% Memory, 1-7% disk. There is NO REASON for that fan to be running.

Until Dell and Intel get that Thunderbolt port dialed in, I'm staying on good ol' USB 3.0. At one level, that is frustrating as I bought the XPS 15 partly because of the promise of the "One port to rule them all."