@C_U Out of curiosity: in the thread Help, terrible beating noise there are at least two people that got printers with not sufficiently greased linear guides. All linear guide rail manufacturers I know tell you to push grease into the correct holes in the guide blocks - I highly suspect simply putting grease onto the rails as Snapmaker currently suggests would not be sufficient.
Such lack of grease in a linear ball rail guide can result in evil sounds as in the linked thread, but it also may cause the linear guide just to become difficult to move or get blocked for a brief moment when a ball gets stuck due to lack of lubrication - something I can easily see as a cause for a layer shift.
Did you check the amount of grease in the linear guides of your J1 and / or lubricate them?