Just thought that I would mention that the whole time I was in Ocean City MD, I basically had problems with the LTE.
As I mentioned, there were multiple times when both Signal Check and the stock Android signal indicator both showed that I had strong LTE signal, but web pages wouldn't load and apps, such as Tapatalk, would time-out.
While I was there in Ocean City MD, as I mentioned, I toggled my phone to 3G only, and I noticed that I got blazing fast speeds. So for the reminder of the vacation, I simply left my phone in 3G mode.
I actually only stitched my phone back to LTE mode as I crossed Chesapeake Bay Bridge, heading back to Virginia. And when I did, I noticed that the LTE worked fine.
Since I have been back in Northern Virginia, I haven't had any problems with the LTE signal. So in my opinion, there is nothing wrong with my phone, it seems that the problem is the LTE on the Sprint towers in Ocean City MD. The 3G works fine, but the LTE seems to have problems transmitting data.