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Did you once "reload" your listener or some similar administration task? If you do for example a "lsnrctl reload" on the server, it is quite acceptable to have 5000 msec on the client at that time. Remember this is a maximum value, not an average.
note that I am also sometimes getting those alerts without being able to tell why it is so. Maybe you restart some db which has to register locally/remotely.
I cannot help you more now