Periodic Nexus 7 touch responsiveness issue Occasionally my Nexus 7 will exhibit poor touch responsiveness. This manifests as a need to drag my finger for an inch or so before scrolling happens, and a need for a firm touch in order to register a tap, and even then it's sporadic.

I'm trying to determine if this is software or hardware. My guess is software: exiting the current app sometimes seems to resolve the issue. Putting it to sleep and re-awakening it often seems to resolve it.

This happens maybe once every day or two, and only tends to last for a few minutes when it happens. (I'm still uncertain if things I do fix it or if it abates on its own...)

As this is my first Android device, I don't have anything to compare it to. Has anybody else experienced this? Any good techniques to determine if it's hardware or software?

EDIT 30-OCT-2012:

I haven't experienced the problem since upgrading to 4.1.2, so I'm inclined to think it was a software problem that's been fixed.
You can try to diagnose the problem yourself, or at least get a little more info by turning on a couple of developer diagnostics.  


In Settings, scroll down to Developer Options.  
Under the "Input" section, check "Show touches".  This will cause a small (white) circle to show on the screen where ever you touch it.  If you don't see the circle (which might be under your finger, so look carefully), you know it didn't register your touch.  If you see the circle lagging, then you know it registered your touch and is just being slow for other reasons.
Under "Monitoring", you may want to turn on "Show CPU Usage" and "Strict mode enabled."

"Show CPU usage" will show you what is running as a little overlay in the top right of the screen.  The top line of the display shows the system cpu load.  See this excellent write up of what the load numbers mean.  If the load is high, your little Nexus-7 
"Strict mode enabled" will "Flash screen when apps do long operations on the main thread."  If your screen flashes, then you know something is hogging the CPU.