Actually, i'll rephrase that, H02 is intermittent stopping/freezing during play (usually due to a faulty spindle motor). In your case sounds like it may be due to either;
1) Dirty or poor pick-up.
2) Sled motor sticking (bad sled motor or contaminated lubricant on the sled rails).
3) Faulty spindle motor. (especially if spindle motor is spinning with top off and no disc inserted).
DVD-RV31 also tends to suffer from dry joints to the surface mount IC's and that could cause all sorts of erratic operation.
Cobweb
July 2005