Thanks for the info. There is no LTE in my home area yet. So maybe I have a defective phone. I can demonstrate the issue 100% of the time at home.
I just contacted Sprint chat support. The guy looked up their database and said it is not a known issue. He also suggested that I should get a replacement.
I appreciate your input! Cheers! I went to get a replacement HTC One. The new one has the exact problem. Death grip....
What should I do about it?
Edit: Found a YouTube clip showing the Sprint HTC One's death grip problem: