Yosemite 10.10.2 and USB hub issue

Hi there,
I got a MacBook Pro (Retina, 15-inch, Mid 2014), OS X Yosemite last December and bought a USB hub (four-port) on Jan 3rd. I was using it for one month with
OS X Yosemite 10.10.1 without any problems.
On Feb 4th I switch to OS X Yosemite 10.10.2 and I started to have 2-4 times the following issue per day:
- mac frozen (I cannot use the keyboard or the mouse) but I see that the clock is working. No other way that a hard reset.
I did check memory and hard drive and everything is ok
- for one week I did use the USB hub and didn't have any issue
- I started again and less than 24h hour later I got a similar issue !
I am not 100% sure this related to 10.10.2 but before with 10.10.1 I had no issue ! I am not sure to understand how a USB hub can crash a Mac.
I try to look a the Consol application but couldn't really identify a common issue a the time of the issue but maybe some messages like that :
Any idea or suggestion ?
Thanks
Cheers
Fabien

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After installing the PPC 10.4.7 combo update on my
PowerPC G5 dual 2.7 GHz (4GB RAM) I have problems
with my USB hub. The update seemed to have been
installed properly (two reboots and no error
messages) but since then my Kensington track ball
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mac...
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