Thanks for the tip! I tried changing that, but it didn't seem to make any difference. I was able to get 3G back by going into the Mobile network settings and changing the preferred network type to CDMA/EvDo auto (it was on global).
However, as soon as I turn on LTE (using the toggle), the data drops to 1x for a moment and then is gone. I have to then disable LTE, turn off the data, and put it in airplane mode and back out again to reset.