Elektron Musical Instruments

Sometimes my SidStation will lock up when attempting to access the *patch*
menu . Specifically here is what happens:

turn on the SS
move to *Patch*
hit the black filled in circle key "D"
the machine locks up intermittently (sometimes I will be able access the
patches and sometimes the SS locks up)
When it locks up, I then have to switch the machine off then back on.
In order to regain use of the *Patch* menu, I must perform these menu
access steps: *System, Mem, Reset* .

THIS ONLY happens when I attempt to access the *Patch* menu. It never locks
up when accessing the *System* menu.

I live in the USA and have been using a power supply from Radio Shack since
I got the SS back in August of last year.

Any suggestions?

thanks.frank.