Hi *,
I do remember that I have the same problem with my i2c lcd display, but it´s been a while and I switched to a Digole OLED display right after writing the tutorial. I thought that I messed up things in my code and thus I getting these errors, so @BulldogLowell you proof me wrong, it´s seems that it is not my fault.
As far as I remember, with my 16x2, I have the problem after several hours, not after minutes. Can´t test it right now because my Core is in use and I´m waiting for my Photon 