DEXAN can autostart. You configured DEXAN to start bottleneck monitoring automatically, but every time you logoff from CUA (omegamon II for IMS) and logon again, DEXAN is turned off.
Resolving the problem
You have to apply the following suggestions to keep DEXAN turned on even after a logoff and a subsequent logon to CUA:
1) Modify RKANPARU(KOIM0P00) to move the EXEC KEICOLM0 statement to the bottom
2) Go into Classic Inteface (T and A option, KOICONS menu) and issue the following command after you see that DEXAN was stopped due to a logoff from the CUA interface
From now on, DEXAN will no longer be stopped when you logoff from CUA.