Elektron Musical Instruments

Played a gig last night and was quite upset to have the following 
happen (though it had happened intermittently back home). Please speak 
up if you have had the same problem of if you know how to reproduce it:

load a song. play it. now load another song. it will display the parts 
of the second song in the window as usual. Press play- it doesnt play 
the second song- it plays the first one! Once this happens there is 
nothing you can do but reboot.

Anyone else? I had to reboot twice during a set! It was evil!

Jon
Retconned