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Try checking in ALL SETTINGS>DUAL CARD MANAGEMENT>DATA CONNECTION>set your desired sim data
Then, ALL SETTINGS>MORE...>MOBILE NETWORKS>(*make sure Data Enabled is enabled)>4G/3G SERVICE>ENABLE 4G/3G (set your prefered sim network)>NETWORK MODE (set to your desire and see which works better) ( there are 5 choice : 4g/3g/2g auto / 3g/2g auto / 2g only / 3g only / and 4g only )..
Hope this helps. anyway maybe check in the Engineer Mode may help too *#*#3646633#*#*
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if this not help then hope some of our experts here can share to solve your problems...
cheers.
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