The deterioration in coverage has been going on for several months.  It does not matter if I'm indoors or out, coverage is the same.  My calls are occasionally dropped.  I have an HTC One M8 that was just upgraded to 5.0.  Right now my signal strength is -81dBm to -73dBm, but only 3G.  My network preference is Global.  I work for a large Verizon Corporate customer, so our coverage here at work has always been very good until recently.