Ok this is really weird. It seems to be a combination of the charging source and the device. My iPhone 6s will charge with all 3 cables on my computer, my 10W Apple charger and my 12W Apple charger. With all 3 cables the computer and the 12W charger will not charge my IPad Pro 9.7 anymore. The 10W Apple charger that came with the iPad is now the only one that will charge the iPad with all 3 cables. When I try the 12W charger with the iPad, the first time I try a cable it says it may not be authentic and after that it says nothing. The same cables still work fine with the 10W charger. I guess I'll try buying another Apple 10W charger. These other chargers used to work and still work fine with my iPhone. Any clue what is going on? I'm wondering if the chargers that don't work are not able to supply enough current for the iPad anymore but can for the iPhone.