What happened to Rotel?

I feel Rotel's product quality has significantly gone down hill along with their service. I would never purchase a Rotel product ever again. I purchased a Rotel RSP-1576 only four years ago and now the volume occasionally VERY low, barely audible even turning the volume to near max. Completely unplug it would resolve the issue and make the volume return to normal. I tried to obtain warranty services through Rotel but was told I need a physical receipt despite I submitted it upon product registration. Their service is absolutely horrible and would try to deny your warranty claim for any little reason they can find. Worst of all, they don't have an actual office here but only a distributor, so their actual manufacturing entity isn't bound by US Consumer laws and there's no way to file a lawsuit against them. STAY AWAY FROM THIS BRAND