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Are you old enough to remember when amps were all linear? Well, this is a computer. I haven't seen the schematic, but I'd guess the knobs are not connected to pots, but rotary encoders which send signals to a processor board to change settings. So, it's either a bug or a "feature" that causes these settings to start at zero when you boot the machine. You may be able to store all the last settings in memory so they start there.
Is it potentially fixable, but probably not worth it. By the time you have paid for spares and an engineer to fix it it would be more than the amp is worth. If it is within warranty then take it back to the shop. It may well have been a fault with the amp.
The unit will require repair and if you are not adept at electronics, you will need to take it to a shop. Likely there is failure in the power supply or amplifier that has blown the fuse. Replacing the fuse WITHOUT repairing the cause MAY do additional damage.