My Ti Desktop Crashing!

[GV1UK]

For some reason my Ti has started crashing and I can't understand why.

I have mounted my Ti on a desktop rack as can be seen below. I noticed it crashed when previewing sounds. I am also using all 3 outputs, which I have noticed causes problems too.

When I preview sounds it works fine, but then a sound will get stuck and continue to play. After a while it will make a loud screech and I have to restart it.

When using 3 outputs, even though only 1 sound is playing, I notice it sounds muddy. When flicking through sounds the samples can often sound awful.

I updated it around September time in 2010.

Any help with this?