DM-24 going crazy

[Manchoa]

My DM-24 is going crazy after about 20 minutes.
I turn it on, everything works fine, but after about 20 minutes it starts to make this crazy noize that will come and go on small intervals. Inputs don't work anymore and only thing that helps is to power DM-24 off and on again. Then it will work again for about 20 minutes.

See the video:

Any ideas?

 

[berl]

You could change your old switching PSU by an ATX slim line, it works very well.
I made a PCB interface between ATX and tascam connectors, see here