Thanks for the responses, kevm14, and tmotytn. I would never have thought of trying that solution.
I should explain that the loss of data primarily happened when I turned on my phone in different locations as I made my way about the area. When I was in a restaurant, judging by the number of people using their Iphones, I would guess that signal wasn't a problem. Certainly, a few of these diners must have been AT&T subscribers. I am not interested in using my phone in a restaurant, and especially when I am with my spouse, but I wanted to see if the data issue had been resolved.
On two other occasions, I left my phone on and travelled to two other locations. Four bars were in evidence, but only once did I have data. I was frustrated and turned off my phone.
At home, I had no problem receiving data. Just to be sure, I turned my phone off and on three times. All seemed well, just as it did this morning. What was most interesting was that yesterday, after I had experienced data loss, when I did manage to access data, web browsing and GPS signal acquisition was far quicker than at any time in the past.
Perhaps the phone's antenna was at fault. There may be a problem with the phone acquiring data when I leave it on and travel to another area. The cell signals in the areas are not suspect.
Two days ago, I activated a Windows Live account and then noted that Marketplace showed that there were updates for the AT&T apps and the HTC Hub. I downloaded them. Perhaps the data issue is related to the downloading. I did not pull the battery after the downloading. Should I have done that?
I would not be so obsessive about this, but I only have one week remaining on my 30 day tryout. I want to make sure that I do not lose out on the opportunity to exchange the phone.
If I experience the same issue, I will give your solution a try. I deeply appreciate your time and suggestion.
Enjoy the day.