I am having the same problem. I am not trying to enter anything after importing and verifying 1099 consolidated, just answering no to additional questions puts me in a continuous do-loop. I am using 2021 Turbo Tax Premier.
1. Form 2439 - I answer No
2. Section 1256 - I answer no
3. ISO Options - I answer no
4. Selling investments - I answer no
5. Investment losses for 2020 not claimed - A answer no
