My first inclination is adhesion. You said you had perfect prints prior to this happening, and with out changing any settings, you started to get fails. So unless you can find another variable that has changed, the only thing that comes to my mind is your build surface is getting less sticky in that location. There might be cleaning instructions for the bed material, try that. Try shifting your print over some.

Make yourself a list of possible fail points and create a check list of things you might change to eliminate each fail point one at a time. That way you can isolate the exact fail point and figure out a fix.

I've had bad luck with blue tape, but blue tape with glue stick is almost too good.