slump

I'm no chess expert but short of a brain injury I doubt you've lost skill in a short period of time, if 2000 rating isn't an aberration it might be a mental thing and if so you could try and chill a bit about your rating and try and enjoy playing, the only other thing it could be is you have been very unlucky and come up against a series of players who all are rated far below their true rating, but that sounds unlikely 😀