Lyra Delos suspension aging?

Recently I noticed that my anti-skate requirement had "drifted" (hadn't been adjusted for 2 years).
Found it hard to blame the tonearm because the weight is still at the same point that I set it to and positionally the thread controlling the pulley+weight looks equally correct and stable.
Other possibilities occurred such as relaxation of the arm wiring with settlement. (Arm was installed at the same time as the cart.)

Finally, I turned my attention to the cart's suspension. Has anyone noticed their cart in need of an "anti-skate reboot" over time? The cart has done less than 800 hrs.

Of course, AS could be a red-herring altogether. It's also possible that metallic debris may have been attracted inside the generator and ended up fouling the cantilever.

Theories?
Needless to say I'll be watching it more attentively from this point. Forewarned is forearmed. ;^)

Now that I'm officially retired I'll have plenty of time to investigate matters such as this :)
At the moment I'm listening to an old magnetic tape recording of a Genesis' live performance of "Twilight Alehouse" broadcast by the BBC on FM radio 40 years ago.
That track seems somehow very appropriate to my new circumstances ;^) :)