lock key problems

[Guest shoz]

hello there to all 3 days have past since the company had replaced my mobiles motherboard again there are some problems when music is playing in the background and when the phone locks the music also stops and when i wake the device by pressing the lock button the music resumes from where it had stopped this problem occurs for both media player(built in) and slide to play also to mention i have installed slide 2 unlock software. Some other issues that i previously faced were the backlight never turned off weird sound in headset while listening to songs and so on .... Pls help me out if any one knows how to tackle this problem.... i would be very grateful to u ...... regards.......