K40 suddenly has no repeatability

After almost 10 months of normal use my k40 will no longer frame or cut at desired layouts and shoots everywhere to cut or engrave.
I havent changed anything. upon receipt of the C3D board last spring I made a back up copy of the file on my computer as suggested. I replaced the SD file with that original and no it made no difference at all.
Thanks for any help.
Chet

It sounds vaguely like your stepper motors are losing steps. Can you take a video (with sound) of what’s happening, post it to youtube, and put the link to the video here?

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