Shift delay problem from 1st to 2nd gear, 2011 TSX with sports package

What is your question?

Shifting delay from 1st to 2nd results in high rpm and jerking. Other shifts are relatively smooth. Found this out by experimenting with the paddle shifters. Car was in a front end accident that needed minor fender work prior to this issue. Transmission fluid was changed twice. No oil leaks detected. No codes on computer or in TSX display. Please diagnose probable causes; e.g., bad gasket near the transmission filter, clogged filter, twisted vacuum lines, etc.

What makes this problem better or worse?

Better when cold, worse when hot.

How long has your 2011 Acura TSX had this problem?

5 months. First sporadic, now incessant in shifting from 1st to 2nd.