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I also noticed strange behaviour with the from blue USB ports. On plugging in an external USB3 drive, I noticed that the led indicator light was 'white' (signifying USB2 connection) rather than 'blue' (signifying USB3 connection). On running a backup, this drive was running at around 30MB/s USB2 speeds. On rebooting the computer (without unplugging the drive) I noticed that the led changed from 'white' to 'blue'. On running a backup the drive was running at around 100MB/s USB3 speeds.
I have several USB3 disk drives and all of them now connect as USB3 whenever I plug them in to either of the front USB3 ports. The only thing that had changed was installing "December 11, 2018—KB4471332 (OS Build 17763.194)" for Windows 10 1809.
Make of this what you will. I experienced this problem, described by others, but it now appears to have 'fixed' itself after installing the latest 1809 cumulative update.
I hope this helps others.
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