Hi All,
I am glad that I am not the only one who had that problem.
The reason why I am saying this is that I did visit an Apple store and was treated like a fool by the Apple "Genius". They said that the firmware did not work with my iPad display. According to them, this happens when when the display is replaced after a breakage.
The tablet was dropped more than a few years ago and I went to the apple store to have it replaced. They told me that the parts were no longer available and I had to have it replaced at a non-apple store. The Apple "Genius" told me that I was lying and that Apple would never do that. I beg to differ on their policies. I was treated like I have never used a piece of tech, even considering I was twice their age and I work in the software world.
Needless to say the iPad has been fine with all the OS updates until I got to OS12.
To end off my Apple Store story, they told me that because the screen was not theirs, they pretty much didn't care and the only resolution was to charge me £200 to swap my "broken" iPad for a like model. I don't have £200 to throw at an iPad at the moment and secondly, why would I spend money on an obsolete version of the product. It makes no sense.
So I left the Apple Store with no solution and just a bit dissed about Apple's stellar lack of customer service.
Now here is the resolution but use it at your own risk.
I decided to search the web and download the I P S W file for os 11.4. I had nothing to lose and I restored my iPad to that version.
Amazingly enough it worked!!!! The screen was suddenly working again and it behaves as expected!!!
The moral of the story, turn off all auto-updates and if it aint broke, no matter how shiny the new OS looks, dont upgrade unless there is a valid reason.
I am happy to discuss this matter further with an Apple employee with some influence but I have got my iPad back.
Thanks and good luck to all.
Grant