Elektron Musical Instruments

OK i'm exagerrating, but this is a confusing little problem i have. 

The problem i'm having is that sometimes when i change onto another pattern i get no 
sound at all. At first i believed this was due to the output routings setup but checked that 
and still nothing, been through all parameters... and still no sound.

Now here is the really confusing bit. I am on track F1 and everything is playing away fine, i 
swap to F2 and its fine and then F3 and its fine. Then i swap back to F2 and hey presto! No 
sound. If i go back to F1 first then go to F2 i get the sound back.

Has anybody got any idea's? Does this sound like a fault with my Monomachine or is it 
software related? I'm running version 1.05.

I just got my MonoMachine the other day and i bought it secondhand so i'm worried in 
case i've been diddled.

Other than that though what an incredible machine.