Mac book air, laggy usb mouse, on the right hand side usb port!!! :|

Hello world.
Been using my mac book air on my 21.5 inch monitor via the moshi HDMI adapter..
I also use a logitec M235 mouse(just a normal USB wireless Mouse)..fot the last week i been trying to figure out whats wrong with it, since its laggin soo bad, and pretty much unuseable..it has its phases, it runs fine for 5mins and then goes back to the terrible lag, the computer is unusable, the mouse would just skip like half the screen whenever i tried to move it..its not the system thats lagging since my keyboard functions fine, its only  the mouse that choppy and lagging
yesterday i swapped the usb port, and then it works fine..
the problem is only on the right had side USB port, can my USB be malfuncitoning, or is it a software issus, I also tried a different mosue, and the result is the same, terrible lag on the Right hand side USb port, and works fine on the Left hand side..
i tried moving the laptop somewhere else thinking it was some interference, still the same!!
what should I do. I also reset the SMC controller, and its still the same..
its just weired, and annoying. and my warranty expires in 3 weeks!!!
Help appriciated!!
model is 2012 macbook air, 8GB ram, i5 processor.. (also i have plenty of free ram and my processor usage is like 10%)

Reset PRAM.  http://support.apple.com/kb/PH4405
Try the suggestion in this article
http://support.apple.com/kb/TS1248
If this does not help, contact Apple.
Best.

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