Had a flight yesterday that had the following occur on approach:

-During a FLCH idle decent, the autothrottles commanded a climb
-Disconnected the autothrottles, throttles came back to idle
-5 seconds later the autothrottles re-engaged and commanded a climb again. This was with the autothrottle switches off, and no indication of the autothrottles being engaged on the PFD. I would manually move the throttles back, and they would climb again after about 5 seconds.
-At one point became high on the glideslope. The flight director then commanded a climb.

Strange stuff!