I've noticed that just recently (within the last few weeks), the signal strength in north Raleigh, NC (at my house and around the neighborhood) has reduced from 3-4 bars with 4G down to 1 bar and sometimes as low as 3 bars in 3G. Is there something going on with the network? I have an up-to-date Samsung Galaxy 5S, so I don't believable it has anything to do with my phone. What gives?