Alright well. These drives require pro tools if you want to replace the board, heck... my lab can't even do all of these drives yet; we are still working on the solutions for some of them.
Most likely the board IS defective, it is probably overheating.
My best advice is to first, use a standard pencil erase on those contacts (the once that are tarnished in the top left of the photo, until they are nice and silver again) that can cause communication errors with the chip inside the drive from time to time.
next, we need to try to keep the board cool.
I would wire up a 120mm case fan to blow full speed at the board, that may buy you enough time to copy data off of it.
please, do not use the freezer trick. It is high risk especially on these new drives.
again, use creative, but safe means to keep the board cooled down, especially around the area that the MCU (The larger chip) and the Spindle driver (the chip place at an angle)
Just to make sure, the drive isn't making any clicking sounds or anything is it?
make sure you put your ear to the top casing, and check for clicking/knocking sounds. These drives do it quieter then the older drives do.