"Could not select any Symmetrix devices to list."

Ever since upgrading from SE 6 to SE 7.1 and ECC from UB3 to UB7 I've had the following problem:

Whenever I need to do anything requiring symdb access (symdev list -noport, for example) I get 'Could not select any Symmetrix devices to list.'.  I then usually have to do two symcfg discovers to fix it.

My question is:  Has anyone noticed this behavior?  Nothing changes overnight, however without manually running 1-2 discovers every day (typically multiple times in a day) it appears as if the database is constantly needing to be refreshed with a discover.  I did a search and didn't see any similar issues so if I missed a solution, I apologize in advance.