stutter sound/video after chaning audio streams.

#1
In China, channels usually have dual audio streams for Chinese and English languages,

but after changing the streams between them using the drop-down list besides mute botton, the video and audio will become stutter, OR sometimes, NO SOUND AT ALL,

I need to click the channel again to let the video and audio become normal.

Please check, this is a major issue.
Windows 7, 64-bit.
Twinhan AD-SP400(1041) DVB-S2.
KNC1 DVB-S2.
Technotrend S2300 Premium DVB-S.
Technotrend C1500 DVB-C.
Technotrend DVB-T TV-stick.
ATI 4550.
Asus Xonar HDAV1.3 Deluxe.
Creative S750 speaker system.
Latest ver.6 of ProgDVB Pro.

#3
Not convenient to go to that place to change the dual audio streams...

Can't be improved?
Windows 7, 64-bit.
Twinhan AD-SP400(1041) DVB-S2.
KNC1 DVB-S2.
Technotrend S2300 Premium DVB-S.
Technotrend C1500 DVB-C.
Technotrend DVB-T TV-stick.
ATI 4550.
Asus Xonar HDAV1.3 Deluxe.
Creative S750 speaker system.
Latest ver.6 of ProgDVB Pro.