I just realized I cannot connect to 4G from my device (Meizu M3 note), just from few days ago (maybe from January 5th, 2019). I didn't do any update or upgrade. I tried to set via *#*#364633#*#*. For sim2, network setting is already in 4G/3G. For sim1, it set GSM only.
When I try to check 4G LTE support band under LTE Information, I got 1 supported band.

Anyone knows how to deal with this problem? I already tried *#*#4321#*#*, but it already there. The 4G connection is available in option but never connected.