SANSUI AMP SAV201V I recently unplugged my Sansui hi-fi separates system for some decorating at home. Now, after I put it back in place, the amp keeps cutting out when passing a certain volume level (it is not a high volume and is no higher than levels I used before.)I've also noticed the unit getting quite hot.The unit is plugged into the same electricity socket as it was before. Is this a common or recognised issue with the SAP201V or amps in general? And what can I do about it?