Customer has a virtual CUCM, CUC & CUP environment running on 2 hosts in the same chassis. CUC & CUP are misbehaving due to known CPU utilization bugs and will be upgraded to latest SU. Question is what to upgrade first? CUC is the most unstable, so upgrading it first was my initial thought, then CUP and CUCM last. Is there any reason to change this order of updates?