Daryle Fry

Alright so here it goes. I have a 1999 honda civic ex with an automatic transmission. Few days ago it started throwing itself into neutral while driving when it hit bout 40mph. Ran flush through it a couple time and it ran for a few days. Than it went ahead and started doing it again. Replaced solenoids, took negative off when changing, than reset it, and took it for a drive. Now it's taking it up to 4-5 thousand rpms for it to shift but no drop to neutral. also throwing o2 sensor codes but that's the only code it's throwing.