How to configure AIMP to enable buffer while playing via smb protocol

[Boxkun]

I got myself a NAS a couple of days ago, and I set up a smb server on it.
It runs pretty well, but when I played a file from my server today, AIMP will not play until it downloaded the entire file.
I got a slow wireless local network, so when I play big files(20MB or bigger), the waiting time is quite suffering.

My AIMP didn't behave like this until today, it will start playing as soon as I click the play button, and buffer the file in the background. Maybe I have misadjust some options.
I'd like to know how to configure AIMP to enable buffer while playing via smb protocol. Thanks a lot if you know the method!!!

[Boxkun]

Okay I just simply reset all my settings, and now AIMP will buffer the file again.
I still want to know where can I adjust the buffer settings! Thx again.