I don't know what the old version was, but I think the latest is 3.4.22251. They told me that there had been issues all year with an older version losing modem connectivity. Trying the update from the menu in the car didn't seem to get the latest version even though it said it was up to date.
I had this happen several times. Finally called Ford tech support. They answered immediately and were very friendly. Got the app reconnected, and two days later it happened again. Called back, and again got immediate help. They asked about the sync software version. It turned out to be a borked...
Long time listener (lurker), first time caller . . .
2nd tank of gas, made 600.7 miles with 17 to go. Actual mpg turns out to be closer to 43 than what it reports.
Nearly 1200 miles on one tank of gas after purchase.
Heading on a long road trip and will see how it goes.