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
