The exact same thing is happening to me.
after my deposit, I feel focused, eager to play good and I do, usually doubling or tripling my BR, but then I lose that sharpness and start failing and losing.
It usually starts when I start a session, and lose a buy-in, regardless of it being a bad beat or not.
I am either angry that I played bad, or that I got unlucky so it's the same thing. The real problem starts right afterwards when I feel the need to return that money, which leads to rush decisions and just bad poker..
My solution was to play more cautiously when facing shoves, and not going for another buy-in if I got angry after losing the last one.