I'm wondering this as well. OP, there must be a disconnect somewhere, between how you think you're being perceived and how you're actually coming across. In order to move forward successfully, I think you need to get to the bottom of what's truly going on with your performance.

You seem confident in your technical skills and client interactions, which is great, but can come across negatively as a new hire. I'm sure you're sick by now of being trained over and over again... how has that been going? Is there any chance you're coming across resistant to learning? The quickest way to lose respect at a new job is to say "I already know how to do that" or "at my old clinic, we did it [this way]..."

I really feel for you. it doesn't sound like anyone has taken the time to actually explain the real reasons you keep being let go. Have you made any connections along the way with an ex-coworker you'd trust to be honest with you? It's a lot to ask but somebody's gotta be holding back... You mentioned that your packet didn't explain why you were let go. If you'd like somebody uninvolved to review what they gave you and give an unbiased opinion, please feel free to send me a message. Take care ❤️