TMS570 Wake-up on DCAN random startup

Hi 

I am putting the TMS570 into sleep mode:

*CSDISSET = 0x73; /*Clock Source Disable */
*CDDIS = 0x7f; /*Clock Domain Disable */

With the only wakeup event set as DCAN event, but im am seeing wakeup events occuring as soon as i put the core to Idle. Not CAN bus is connected so there are no frames. Also all three DCAN's have the WakeUp Pnd bit set. 

Can anyone shed any light into what i may be doing wrong?

Thanks