Keyboard glitch ?!

[pistonica]

I am playin' NBA 2k12 on my pc...at high settings and i use a usb keyboard cause i don't have a port for a wired keyboard...i only have usb ports...so here is the problem...after a while when i am navigating through the game menu the keyboard just stops working...and it's like someone is holding the directinal up button...it move's in the whole menu by itself...and anything i would push on the keyboard doesn't work...i use the mouse to exit the game...and then the keyboard still doesn't work..i can't write...i can't do anything...only the mouse works...and this happens every time only on this game...and here is the funny story...the same thing happend last year with NBA 2k11 as well...can i do something to fix this?...please help me...thanks!