Many thanks to you and your comments.
One should always refer to the time scales over the weeks that I reported.
At this point of time today, my iPad First generation is working very well indeed.
It started as a good gadget in February of 2011.
After the upgrade to iOS 5.0 about one month ago, the Mail App, previously perfect, started crashing in mid composition of email messages,like after tapping about 6 lines. No backup, all gone.
Later I reported some advice from an Apple rep on the phone eg.restore as new iPad from iTunes..
This did not help, so I went to the local Apple Store near my home.
They did the installation of FIRMWARE. And it was ios 5.0 . Presumably from a better source or somehow a non corrupt upgrade. This was excellent. And they did not charge.
At that time, subsequently, I was asked what iOS I was using. I answered, note-- after firmware install, that it was 5.0 .
When the announcement of the Software update, on the iPad, appeared lately, I did the upgrade again by myself, thru the Net, without iTunes on P C, to 5.01.
My iPad is now working well, and has ALL THE bells and whistles .
The Firmware thing at the Apple Store was the turning point and I have never looked back!
Good Luck to you all,
-G