The problem has been resolved as of today, though I don't know for how long. I have not heard from Verizon or Yahoo which one would expect.........
I made a mistake. Unfortunately the SEC OND problem has not been resolved: the lights of the 3G go off and I have to turn off the phone and turn it on again to get the lights on again and the downloading and uploading of email going. This does not seem to affect Gmail emails. So far Verizon Wireless does not find a problem, and things it could be a software problem. This happens a couple of times a day, usually early morning and late at night.