For the last few weeks, instead of saying 4G my phone has been saying 3G with maybe two bars if it's a good day.  Now, my phone says 1X and keeps dropping in the middle of calls.  I use my phone for work (I work remotely with people across the country) so I have to be able to have a reliable connection instead of being interrupted every few minutes with "you're getting garbled again".  Can someone tell me what's up?  This has only been an issue for the last few weeks, and my device and address have not changed in that time.  Thanks!