For TX2500, does anyone heard some sort of cracking sound (like the sound when you turn off then on the speaker) while playing music, like once every 5 minutes; and when you push the mobility center screen button, but not when I open it from control panel? I already turn off the a band, so that's not the problem. I heard the clicks over both the built in speaker & a headphone, so it's not a problem with the speaker or headphone. The sound is rather faint, so it's more noticable when I used my headphone. And, I also didn't max out the volume.