Four days back while typing, the LED suddennly went off.But M1 button was glowing. i pressed LED ON/OFF switch but it didn't come back. i was stunned

. then i gave a soft slap on the side of the KB and voila there was light. But again after some time it went off. i had opened the software and clicked M2.Nothing happened. slapped again and then the led changed to blue. and again after sometime it kaputs.

UNPLUGGED AND PLUGGED also in the back USB port.no profit.
So from then onwards it is happening like that. i reinstall the software but no help.
It seems that some loose contact is happening.. what should i do now? is there any issue with the build quality of such a priecy KB in general?