Rak7249 LTE not good

Issue:LTE connection buggy

Setup:RAK7249-13-142. Basic station mode. Using firmware 1.3.9

Details: Using LTE connection, the unit is mostly offline. Area is good, no problem with signal strength. After reboot Gateway is online. After a while it drops, then reconnects at random times. Its not useable in this state. Its offline 80% of the time.