Looks like BURN of some kind - best guess. I would cut off any leaf with symptoms and then check & make sure leaf isn't too close to heat or light. A heavy flush & then water only No Nutes then see what happens. If it's an Auto they are very TOUCHY when it comes to too much of anything Always remove any debris from pot in case of mites or other insect making a home. Auto's need constant care and daily inspection You can clean leaves with a wipe with alcohol/ top & bottom of each one. Takes time but worth it. Good luck
