ABS bed adhesion issues

Does anybody have an idea, why I have these intermittent adhesion problems with my print sheet?
The Filament is Flashforge ABS and the sheet is the one that came with the VC3.
I have tried cleaning it thoroughly (soap, water, IPA) and have tweaked my Z height and bed temps to no avail.
Could the PEI just be end of life/damaged at that location?
Does anybody know of good print sheets for ABS use?
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