EIC Server is Busy - Deferring Access to Server

Wonder if anyone else has come accross this issue.

When our users log onto EIC, they sometimes get "Server is Busy, deffering access to Server" and then could take anything upto 10 15 mins to open the EIC session.

I wonder if anyone else has seen this, or if there is anything that could be done!

We are Ecc6 EHP3 (yeah I know, not the greatest EIC!)

Thanks in advance!