MegaManX268

I just bought an 02 Tacoma and it drove smooth and perfect for about two weeks. I just noticed on my last long drive I made (150mi) that while cruising it will get grabby or choppy likes its shifting or trying to shift. I check the transmission fluid with it running in park and in neutral and it was at about the cold mark so I added about half a quart and that seemed to solve it for a day or two (may not have done anything since I have driven it that much since I added the fluid) I noticed it doing it again today and I checked the transmission fluid again and it at just a little above the hot mark so its full. Any Idea? Thanks.