Over the summer I had my transmission fluid done on my 05 v6 tacoma. Since then it had been driving fine with the exception that after two or three hours of continuous use the transmission would begin to surge slightly between shifts. Out of curiosity I opened the 5mm Allen bolt this morning (outside temp 80, car hadn’t been run in 14 hours) and about a quart of fluid poured out. I closed it back up as soon as the flow slowed, took it for a test drive up to around 55mph and it seemed to shift fine. Should I be concerned? Has anyone had a similar experience?