Volume very low on Arcam A85

kinega

Today my Arcam A85 developed a fault with the volume. I typically would have the volume at about 25% to listen at a reasonable level. Today it changed & needs to be over 50% to achieve the same levels. Have tried powering on & off, reset to defaults but it remains low.
it is still usable and sounds fine with the volume cranked up higher, but I am worried this could mean further problems will develop.
quick google search reveals several reports of complete failure where you can only just hear music with volume at max.
anybody else experienced this?
many thanks