Recently, the Sunfire Grand Cinema amp in my system has started acting funny.  When it is turned off, meaning the actual switch on the back of the unit is the off  position, the amp is still acting like it's on.  It makes the buzz sound and the meter on the front of the unit reads 300 joules like its been turned on.  

I haven't found any info on the internet that deals with this situation.  I'm stumped.

Any ideas?

Does it ever eventually quit or the meter go to zero like a slow drain?

I don't know, I unplug it to make it stop.