Mistracking zyx after hibernating?

After about 6 months of rest, my Zyx 4D gold now breaks up on some piano notes and vocals. I had about 250 hrs on it when last played and it was tracking perfectly. I'm pretty sure that it sounded perfect the last time i heard it.

It sounds quite similar when it had less than 20 hrs on it. I haven't touched the tracking force (1.9 g) since then. Tonearm is SME on a michell deck.

Is it possible that it would need some breaking in again? Anyone with the same experience? I'm getting a bit Impatient and would really appreciate some input and reassurance so i can get some sleep again.

thanks in advance for your responses