Question vs980 gps not work on wcdma

hello gus .I got a vs980 unlocked. When I use cdma sim card, gps works, but when I switch to a wcdma sim card, gps sucks.
I used gps test pro, actually it found about 24 satellites,but can't lock on anyone.
I tried to change sim card without reboot, gps sometimes works.

How can I fix this problem?