Thanks @afixer44321 ![br]
I really really don't want to open this thing up, but at this point I'm willing to try. I've rebooted the phone multiple times, reset network settings, etc. - nothing has worked. It's been like this for a good 6 months or so.
I've replaced a good 40+ screens and another 20 batteries over the years (teenage daughter and friends) so I'm quite OK with working under the glass. That said, I know from experience that it's always good to avoid opening a phone unless you absolutely have to as you always run the chance of causing more damage.
If you have any other thoughts or suggestions to resolve this issue - I'm all ears and eyes. Thanks again for the post!