I have found by setting "Mobile Network Searching" to 4G only and in "Network Settings" turn off Auto Select Network. My B818 stays connected. I reside in a 4G area.
That's a great tip, D_V_M. Thanks very much for sharing on Yes Crowd.
Ok I lost my post again...
I went through such hassle to exchange my mobile wifi and been hours on the phone with Optus tech support (useless) ... and it still dropped out this morning.
So to summarize, are the following settings correct?
AND switching off the "auto-select network"
The 2 settings you have to change are:-
Network settings - Internet connection - Auto-Select Network - Turn Off.
Mobile Network Searching - Preferred Network Mode - Select - 4G only.