Probably just a control out of place.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Harman-Kardon-HK3550-Receivers-manual/id/386ag412/t/2/
NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.
Turn the volume control to something medium.
The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.
Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.
There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
Turn the volume to something reasonable and see if that helped.
Sound is muffled or none existent. Sound actually comes out clearer some times when holding the keyboard at the ear. Verizon claims never heard of issue. I have 3 of the phones from Verizon under family plan and all 3 do it intermittently.
I just bought the Motorola W755 and will return it because I can't hear the other person's voice. The sound is also too low using speakerphone. I have the volume turned all the way up. This is crazy. BTW, my hearing is just fine.
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