I've had the Samsung HW-Q600A soundbar and the rear speaker set SWA-9100S for over a year and had no issues before.
Previously decent Atmos tracks were coming from all soundbar channels, and quite low yet properly distributed surrounds from the rear speakers. I always use the "Surround" feature while playing 4K discs on my 4K player or content via streaming.
There used to be surround sound, but now the rear speakers duplicate sound from the soundbar side channels, it seems that sound from the soundbar side channels is duplicated on the rear speakers - they're too loud now, and they never were before.
I also can't properly hear sound from the top channels of the soundbar. Certainly, something has changed. I recently updated the firmware via USB but I don't know if it was a culprit. Please could someone advise what may be causing the issues I've had for the last two weeks and how to eliminate them?