I do know after looking at reviews that this unit costs a lot of money but unfortunately this one needs to be taken apart and thoroughly cleaned especially the switches, including the control board with electronics cleaner. I believe that somehow the mainboard is either really dirty, water damaged, or just plain bad as it seems it cannot keep it's signals straight! I would try the cleaning of the board 1st but, I also would not unfortunately be surprised if it was truly bad!
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Can you disassemble the toaster and upload pictures of the circuit boards inside the toaster? Adding images to an existing question
crwdns2934271:0crwdnd2934271:0 Andrew S crwdne2934271:0