So far this has happened three times where the tablet will not respond to my touch for a few seconds then respond. It will keep happening until I restart the device... I am running kitkat anyone else getting this?
I had this problem a lot on 5 2013 Nexus 7's ...it was really frustrating. Then I got my 6th...and it was fine...even with Kit Kat...and now with SlimBeans ROM 4.3.1. Do you by any chance have any case on your Nexus 7?
If you have a screen protector, try removing it. I had the SPG screen protector that caused the apparent grounding issue. It went away completely when it was removed.