[Q] Phone switches carriers down to 2G as preferred instead of up to LTE

Hi all,

Currently using Xperia Z2 with KitKat. My carrier is DST (Brunei). My carrier uses three separate operators - LTE DST, 3G DST, 2G DST, all viewable in the network operators search page.



Quite often my phone decides to drop down to 2G DST operator as the preferred, without desiring to change back up, even with switching on flight mode. If I manually search, I can see all 3 available, and if selecting either 3G or LTE, they operate smoothly for a while - 20mins or until I lock my screen.



I have noticed this with previous phones on this carrier too.



Is there anything that can be done to either lock out the 2G one, or make the phone understand that is only a last resort?



Thanks

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