On Thu, 13 Dec 2012 17:06:09 +0000,
(D.M. Procida) wrote:

The arm on my record player reaches the end of a side, then seems to
leap back, often landing a couple of rotations back into the groove.

What could cause this?

Daniele

Something is forcing it back. Lift it and check for free movement all
the way across the playing area as far as the label. If this is an
autochanger, almost certainly the end-of-side mechanism is stiff and
needs stripping, cleaning and oiling.

d