WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata, 2004 Mazda MX-5 Miata, and 2003 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the oscillation torque as shown. If the large end does not drop by its own weight, replace the piston or the piston pin.