The middle part of my Samsung corby touch screen isn't working well
Sometimes I keep trying to open (My files) folder which is in the middle of the screen (the part that's not working well) but I cant, the middle area of the touch screen isn't working fine
Is there any certain way to make it work better ? maybe perhaps using oil or sth to clean the screen ?
I think the screen isn't totally sabotaged cuz sometimes it works and sometimes it just doesnt for a reason I don't know

Should I perhaps open the phone and do sth from the inside to make it work better ?