Hey,
I just want to give another view on this topic.
I have an iPad 3 64Gb here. Since 4 days I´m having the same issue...it didnt charge. Then after waiting a few times, it charged, but extremely slow. I thought maybe it would be broken now and quickly made a backup. I am using my iPad everyday and it is really bad that it stopped working. After the backup it didn´t charge again...
I tried many things like e.g new cable, 3 chargers, Laptop and many reboots but neither one of them worked.
Since I had a backup I deleted my settings (Not my data) because I thought it may work then.
This also didn´t work so I thought if I will reset it completely to facturynew, it could work.
I also thought it is a software issue because when I turned off and plugged it in, it immediatly turned on like usual.
So it knows when it gets charged (also when plugging into the laptop)
When I am plugging it in it also don´t shows the "not charging" or sth else. Just as if there isn´t even a cable plugged in.
Sometimes my pc makes that connection sound but shows it as unrecocnisable device so it don´t knows if it is an iPad or sth else. I also tried dfu mode but it didn´t work neither.
So now I am sitting here with a restored iPad which I can only charge when I am turning it off. (And then it is slow too)
And I can´t use it because all my apps are deleted. My backup is also inaccessible because I cant restore my ipad cause the cable connection isnt working.
So its not usable anymore. I used it a long time and it was really reliable. Since Ios 9 it got slower and slower and because the software support ended anyways I think that apple wants these old devices to break and stop working...
Really sad because I really liked it. I would like to buy a new one but it is too expencive and I dont have 600$ left at the time.
I want to finish my pc which I am building first and I hope that it may fixes itself when I dont use it that often but I don´t think that will happen.
Maybe some people have the exact issue, so I tried to describe it as clearly as possible. I will see, if it will start working maybe or if I can at least recover it to the state when I had my apps and data...
Best regards