my apologies if you have already tried or considered any of the following:
have you checked the user manual to see if there is a setting you can change?
have you started using a different (heavier) weight thread in the bobbin?
is it just on your current project, or does it happen no matter what you are working on?
i ask those two questions because it might be a top tension issue. if the machine is "holding onto" the thread too tightly, it will stretch just a wee bit and then spring back when cut.
those might be wild ideas, but thought i'd throw them into the mix.
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