Redneck Broadband - fixed!

the beginning of the story

It was my fault!  Monday's 28Mbps was not an anomaly. At one point in the installation, the WiFi hot spot crashed and I had to do a factory reset.  Little did I know that factory reset disables the 4G radio: our throughput dropped to an abysmal 200Kbps.  Once re-activated, 4G speeds came back and remain consistent.

After crowing success, then lamenting failure, I'm back to shouting "success!"