Management Interface has become slow and unresponsive.

Without diagnosing exactly what the memory leak is that you are experiencing, it's tough to say. I know there are multiple memory leak fixes in 11.3.0 HF8 alone. Those are almost certainly included in v11.4.1 HF3 as well. Either one may help resolve your issue.

I would recommend opening a case with support to diagnose the leak so they could give you a definitive answer.