+1 on upgrading the hotend.
But I agree 10,000% that you should not be having any issues at 1 week. Shipping can be hell on pretty much anything, so I can;t badmouth SD on this (although others could). Unfortunately, it would be cheaper and definitely faster to replace faulty wiring yourself depending on the true cause.
If you feel that you are wronged and unacceptable, contact SD ASAP. Just bare in mind they are at least one week behind on shipping new printers as promised. So it may take much longer for SD to fix it.
Catch 22 in my opinion.
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!