Verizon just advised me (when I purchased new Mi-Fi for Mother) that they are literally working around the clock to upgrade service all over the country. 50% of their capability is used by 2% of their customers!!! If that were to continue, we'd ALL be without connection service shortly.
New and advanced towers are being installed everywhere. Some places will temporarily suffer a bit in these transitions. I've noticed it here, too. Ultimately, it'll be worth the wait and frustration.
For my part of the world, Verizon is still the best. I called AT&T about 6 months ago and told them I wanted a divorce. :D
Jan in VA