Default [Q] Help me! Xperia Sola always connect headphone

My Xperia Sola is always connecting to headphone mode although I have tried to plug in/out headphone many times. Now I can't hear inner speaker when I got a phone call or listening to music without a headphone plugged in.
I have cleaned the jack hole as well but in vain.
I also flashed the stock ROM but it can't help.
Do you get this issue ever? Please tell me how to fix it.
Thanks.
Sony Xperia SL
Ipad gen 1 - 16GB 3G
LG LU 6200