HELP: WD External Hard drive disconnecting by itself after Maverick OSX update.

Hello!
I just finished updating my OSX from Mountain Lion 10.8 to Maverick 10.9
I am using 15 inch Macbook Pro late 2011 processor is i7 and 4GB memory.
Before on ML I'm rarely or never expirience this where my external drive is disconnecting
by itself. I am using USB hub (10 ports) I have 2 HD's both are 1TB and on that usb port
my cooling pad is also connected as well the data plug for iphone. My USB port has another
power cable which is also in use.
Now I have three questions
1) Do you think that one of my HD has an issue? because this is the only one
that is disconnecting by it self? when I unplug and plug it back it shows to Utility Disk
but it is not mounting. I manage to restore it by clicking the repair button several time
but it keeps disconnecting by itself and I am not comfortable on doing this time to time.
2) Do you think updating to Maverick is one of the reason why this is happening?
3) What solution i can do to solve this issue.
Thank you in advance.

Hi to All
It seems my issue is already solved I didn't expirience any auto ejecting anymore after I formated my 1TB using the Disk Utility. I already bring back the files that I removed before from my 1TB and so far its all good.
Another tip is if you will plug your external HD's to a usb port give a one interval slot because if you do there's a possibility that it may auto eject again, this happen to me since updating to Maverick but in Mountain Lion maybe it happen to be once or thrice maybe because of bad ejecting that i've done to my 1TB.
This all is as per my intuition, observation and pure guts but now im good and my usb's are not auto ejecting anymore from the day I'd format it to disk utility using erase (of course in exfat format) until now. I wish this will help others too...
Have a nice day!

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