Problems changing from Edge to 3G

[magyosha]

Hi all
my wife and i both have Note 2's ..
mine rooted, hers not
we are both having issues that edge connections to to be the norm for data even when 3g is available..
i'm having to force 3g by setting network to wcdma only when i know there should be 3g
sometimes (after a while) it does go to 3g if left alone, but very rarely

network is Thailand AIS one2call. using the same sim card i had in my old S3 that had no issues
N7100XXDLJ2