Media Center, Media Player Bugs

I have noticed a problem with each of these programs.

1.) On occassion, Windows Media Player will do something strange. I will
click on some media (music or video) and I can hear the sound but Media
Player does not come on on the screen, does not show up on the task bar, and
does not show up in Task Manager. If I click on Media Player's icon, it will
instantly pop up, playing whatever media I had previously clicked on. If I
close it, the same problem happens. It's like Media Player runs cloaked in
the background and it will not show itself. Only a restart fixes this.

2.) Media Center sometimes has problems after burning DVDs. After burning
a DVD, I will try to watch TV and it will give me the Signal Loss error.
After this error, Media Center will "stop responding" until I reboot. This
sometimes also happens after long periods of sleep.

Does anyone else have these problems? They are somewhat sporadic, but they
have occurred more than once.