Bad board? Or Crazy?

Ok I have posted on y axis probelms recently. My SD2is about 2 weeks old and only ran for about 1 week which was just calibrations. Bed level being the worst cuprit of bad prints and I suspect wobble cause of dragging the extruder head

Well after getting it working I started printing real parts and then the y step problem started. FOr a week alignments and voltages check lube etc. I know this thing is not binding I can tell when it is and isnt and it is dialed in. Then the bed level problems got worse. Warped plate. really bad about .2mm from middle to edges. SO I had to plan my zstop if I was printing a wide or small part.

SO I tried printing and tension adjustment with measurements and always had y steps to the back. ( i tried filament and monitored and not the issue) Finally rebuilt it and went to glass. Night and day. The squish and level and stick problems go away! And then you can really see a differance in your calibration. So last night I get 2 small pieces that look awesome. Best prints yet.

So I go for a big job that failed all the time before it starts out perfect up to teh fail point (layer 16) and it goes past it I leave and come back and it failed. of course. Dam machine so inconsitent. BUT it failed by stepping to the front of the machine? Not the back, weird never sen that.

And it stopped mid print. no errors or warnings. SO I killed teh job rebooted usb and power reconnect but only heaters can turn on. Just sites in idle state. And I notice all of the defaul log values load up as zero. So I reload firmware. It uploads but still zero default. I manually type in M92 codes for xyz and they work but the motors barely budge. They all move but slolwy.

I wonder
1: I assume my whole board i bad?
2: How do I get eeprom to take or upload the Mcodes? what am I missing.
3: i verified the firmware is uploaded by changing the author and that works so it is loading into the eeprom
4: I wonder if board was bad all long, made lots of whistling noises since I owned it and explains the y step failure it was board all the time just getting progressively worse.
5: Can I change just the prom out or have to pull whole board and drivers? If I have to replace what should I upgrade too?
6: I know it was not heat related  because I would print back to back prints and they always failed at same part from the first print to last print if heat related the problem should happen sooner as things overheat. I also could improve it a littlw with the belt tension but after all this belt adjustment no way are things this sensitive. I know I am close and it ran fan with no adjustments before so it should work

So am I going crazy is board bad? is belt tension this critical that I have to adjust after every print.