iPad touchscreen duplicates letters

[Wolfpac2056]

I have an iPad 1 that's about 6 months old. Just recently, the "p" and zero keys have started to put 2characters down when I i press them only once. I've tried restore, cleaned the screen (water only and lint free cloth) but its still happpening about 20% of the time (see what I mean?). The pp and 00 keys (see there it goes again) are at the same location on the touchscreen. Any suggestions or is it time for a trip to the genius bar?