Eheim filter question

Anyone with an Eheim 2217 - Assuming the filter media is completely
clean (no clogging materials, etc.) - does the filter lose its pumping
capacity over time (several years). I am noticing (just in the last few
months) that my Eheim is not pumping as good. It is six years old.

The impellar, filter media, etc. is all clean and the impellar moves
easily and freely. The filter just doesn't seem to pump like it used to.

Is this normal? Is it just wearing out and losing power and it is time
to replace it? I sure hope not. Six years seems like too short a time
for an Eheim.

I don't know what else it could be .... anyone experience this?

Thanks for any insights....

p.s.
I'll wait to see what people say here before I start to replace the
magnet parts (maybe that's it??)