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Firmware update 3.7.1 broke filament loading #1873
I have a Prusa MK3S which has been working flawlessly since I built it last December, running Firmware 3.5.2
The MK3S wasn't introduced until February of this year. Perhaps you downloaded the MK3S firmware, when you really wanted the MK3 firmware. They are different. (Ask me how I know... -- but I caught my mistake before I started a print).
https://www.prusa3d.com/drivers/. (just scroll down a bit for the MK3 firmware)