Diddy 's 17th day of trial might have been the most shocking yet ... taking the court on a roller coaster ride through Bryana Bongolan 's second day of testimony -- and resulting in Diddy getting a warning from the judge.

The mogul was back in federal court Thursday, and the day started with Bongolan taking the stand again for her second day of testimony. Instagram / @banathegoat

The defense hammered her on the date she alleged Diddy held her over the edge of the balcony ... arguing it can't be September 26, 2016 as she said because Diddy was in New York at the time.

They pointed to an event Diddy attended, shows he performed during the "Bad Boy Family Reunion Tour" on the East Coast, a hotel reservation under his alias "Frank Black" in NYC at the time and questioned how he could

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