In the setup I have the 440 set to “LTE Preferred” but am curious if it has to fall back to CDMA will it lookback every so often to see if LTE is once again available. I have been told that there is a setting in the 440 to define the time limit for the lookback but I cannot find it and it seems that when the gateway falls back to 3G for whatever reason that it is stuck there until a reboot.
I found the problem. I was two versions of firmware out of date. When I updated to the newest firmware the option for the lookback was there.