When you say third device are you saying third iPad? Was there a cause you were informed of when you had them inspected by Apple (assuming you did have them checked)? Extremely odd you would have that happen 3 times to 3 different devices in that amount of time or ever without there being something playing a part in it (maybe something like water/liquid damage, surge of some sort from using a 3rd party accessory that may not be good, etc). Since you didn’t actually ask a support question there aren’t any suggestions to give you other than maybe consider getting AppleCare+ in the future assuming whatever is going on isn’t from something that would void it or the manufacturer warranty (or something similar if you decide to go with a non-Apple device next). And if for some reason you haven’t taken it to Apple or any authorized repair facility to try and pinpoint what is going on…do that so you can possibly find out how you are managing to have the worst luck repeatedly.