Purchased May 2020. Backlit keyboard stops working. twice I've contact chat. 1st tech remotely installed Samsung Settings Expansion pack, all good, after I was told to return under warranty. after 2 days stopped again. 2nd chat needs return. Man I have this all set up. FN F9 does not work. seems now FN f10 doesn't, don't know it worked before, same as FN F1. FN F12. Been checking out the FN keys.