Reply to Ok.....so is my s4 shot?

Ok so I just got 2 new traktor x1 mk2's in the mail and brought one to my gig as excitied as I can be to use and mess around with. I get everything all set up and ready to go and then my macbook gives me this error message saying it disabled my USB device because it was drawing to much power from my laptop. Ok so I had my S4 the X1 and my F1 plugged in, figured there was something I didnt read about the x1 so I rebooted my laptop unplugged everything and just plugged my s4 in so I could just do my gig and mess with it tommarow. Well I get this message again, I play with it a bit, and it keeps turning on and off, I noticed when I pick it up and turn it on an angle backwords, itll just turn off all together. I tryed all of my USB cables believeing one may be bad, no it keeps doing it. Well called a friend to do the gig for me and went home. I plugged the s4 in again keeps doing the same crap. So I plug in 2 X1's 2 F1's and no s4 all seems well, no issues....OK must be the s4 then. Im believeing it is done for and broke. I will note that I have been having issues with it the last 2 months or so. About every 4 gigs, Ill loose sound out of one side of my headphones, tried everything to fix that but it will still happen every so often. In the last two weeks my track load buttons and search have not been very responsive, ill have to push the 2 or 3 times before something happens, oh and on time my left pitch fader went absolutely apeshit and was going all over the place and I had to lock it at one BPM and just sync my entire gig. lol ok im sure this is alot but anyone else's s4 just break like this? Is there anything I may have been doing improperly over a period of time, like with starting it up, what plugs I use etc. so I dont break my next set of gear to? I was litterly going to get a DJM 900 in like two weeks thats why I got the x1's so good thing im semi prepared. Alright now next step I have 3 gigs in 3 days, I can borrow my buddies mixer but I know im going to need an interface for the next 2 or 3 weeks, im believeing audio 2 or audio 6, what are the differences, what do you guys believe? any feedback would be great sorry im a bit all over the place but my heads about to explode, thanks