I have not experienced the no volume issue on our 2020 Outback Premium but loss of tone setting happens almost daily. Bass, mid and treble all reset to -0- as does the virtual stage enhancer (under "vocal image" to the right of balance. May be part of the standard radio only as I did not see it on your HK screen). Additionally under settings / sound / audio, the virtual bass and dynamic beat enhancer also turn "off" on occation. Getting very old. The dealer was unable to duplicate but depending upon the response I receive from Subaru Customer Care (just e-mailed Friday) I am hoping to take it back for a fix.I had the same exact problem after remote start last week.