New MBP - Thunderbolt drive disconnected when touched

[comatory]

OK so I have this weird problem that has caused me volume failure already. This MBP is late 2013 model bought last week from refurbished store. I have a WD My Passbook Pro drive and it's acting weird.
When I for example just slightly move the cable (or tap the top of the end), the drive ejects itself. I tried switching ports and the same thing happened on the other port too. Sometimes it doesn't happen at all but when I unplug it and plug it in I can replicate the problem in 2-3 tries.
Hm, so I thought faulty cable or whatever. OK I got different TB drive made by Seagate. Same thing happens with this drive too. When I try this on different Macbook Pro Retina (late 2012 model), everything is OK there.
This leads me to conclusion that my hardware might be faulty. I tried googling this problem but didn't find anything. My MBP is of course with warranty but I'm doing a professional work on it and I can't really afford any downtime so I'm trying to figure out what's wrong.
I'm running OS X Yosemite and it's giving me trouble too, mostly graphical glitches and computer froze few times.

I'll try SMC reset but I'm not sure it will solve anything.

 

[MacInTO]

Does the USB connector feel loose in the socket?

If it works properly in your other Mac, I'd say return it and try again with a different one.

 

[comatory]

Does the USB connector feel loose in the socket?

If it works properly in your other Mac, I'd say return it and try again with a different one.

USB and TB ports seems to be ok, I don't feel any unusual wiggle. You can do a slight movement in the port but it's like on other computers.

Anyway, I'm knocking on wood, I did SMC reset and it seems to be working normally now. I tried 10x times each port, tapping on top of the cable and wiggling in slightly from side to side and it hasn't disconnected yet so hopefully it'll be allright.