My first guesses:

1) Memory leak and you haven't rebooted lately.

2) 1095-A with PTC entered in the return (possibly with SEHI).

3) QBI present, I'd guess with either a TI limitation or in the phase-out range.

I recommend always entering the 1095-A last.  Also might not hurt to do everything else before you "activate" the QBI info on relevant forms.  These are both math-intensive areas of tax law.

Rick