Final Fantasy Tactics: The War of the Lions

[dragoons]

For the first, Big thanks for ppsspp it's awesome!!

But for the latest v.0.9.8 ,I've got problem with sound effect in
FFT war of the lions.

While i playing the game for a while it's sound effect

had got problem such as sound of sword , magic included menu chosen sound.

But BGM sound is fine. I tried to reload many save states, it work for while but at last there's problem again .

For previous v. didn't have this problem.I play this game on Windows 8.1 64bit

How can i resolve this? Thanks.