my battery charge indicator is continually flashing on and off My battery charge indicator (the screen info saying % full), flashes on/off/on/off, etc. sometimes.  

I've switched the battery to a spare to see if that helps but it didn't.

When it does happen, this seems to happen at all the different wall sockets where I am.  It happens a lot in cafe's.... perhaps not surprising... but also in my office building which seems pretty solid for such business services.

The only place it doesn't happen is at home.

My original theory was that it was due to too many people using the same circuit and reducing the amps too much.  However the more places I see this behavior in, the less I think it is likely.

Any idea how to address this?
Have you tried using a different cord/charger? 

It seems as if it isn't related to a specific location, so I would suspect that the cable has gone bad.