YES!!! I am not the only one, glad to hear, i also did a google search w/ weak results, sound like we are twins :P
anyways, I had original Galaxy before and never had problems walking around house, inside of school buildings. but now w/ Radar, seems like I have to be near a window or edge or building/house. If I'm dead center of my house, I'm losing the call. I was on the phone pulling into garage, and yup, phone lost connection. My wife is running into same issue.
Extremely frustrating and disappointing. So far only 1 important phone call dropped, but hopefully I can live w/ it, or maybe an update can fix it