Ok, I reluctantly reset my iPad. iBooks then worked for about ten minutes and stopped again with the same symptoms (blank screen). Also, Apple Music stopped working, too. Then I restarted it again and iBooks worked again but that is the symptom I was getting today..it works for a few minutes and then goes blank. Maybe it will keep working this time. I will monitor for a day and then let you know.
Meanwhile, all my WiFi passwords from different places are now gone. Yes, I can reenter them but now I have to ask at each restaurant and other locations all over again. Not as easy as it sounds when dealing with foreign accents, thus my reluctance to do a reset.
Just tried Apple Music again and now it works. Perhaps it was waiting to update from the reset. Took about ten minutes. App store took about that long to work again, too. Am I too picky? It feels like Apple is slowly losing it's reliability factor. Naturally, I will give them another chance but I can no longer brag to my friends anymore about how reliable it is. That's not your fault, of course. I'm just being crabby.