I was having the same problem and it was super frustrating so I get you. I re-authorized as well to no avail. I finally changed my password in Pandora and re-authorized in Sonos and am limiting my use of Pandora to just Sonos for at least a little while to isolate my variables. This seems to have solved the dropping issue...fingers crossed that the fix is permanent. Wouldn't it be nice if this fix worked for you? HTH...
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