I hear Vegas is very hot right now. Do you notice the outage when it's hottest out, like high noon?
As for a second connection, I know they offer cellular backup if you get their security system. Then again, I also heard they recently ditched their security platform for another provider so that may not be current. Cox Business(CB) also offers a cellular backup that can be added to any CB package. You could probably get the same effect with a router that accepted tethered phones via USB and had a failover function. I know you can with Asus routers, but plenty of other manufactures offer this feature as well. My point is you have options.