For some reason, my receive volume just recently began maxing out at +5 maximum. I have completed the auto calibration six times with the same result. My maximum volume was previously +18 maximum per max volume indicated within the manual. I have gone through all of the troubleshooting steps as well. My volume is now a bit more than half as loud as it previously was for 2 years. I used to not even be able to set it at zero without the system being too loud. I can turn it up all of the way to +5 now and it is around half of as loud as it used to be at zero. Does anyone have any feedback? Thanks!