Some days my slider is on and unhittable and others I have no control over it. I didn’t have the usual plus command in my last start as well. Any tips to get me back on track.
Tough to say without seeing you pitch. Inconsistency of command can trace back to inconsistency of any of the mechanical elements of your delivery. It can also trace back to things like differing mound conditions, changing energy level (think nutrition and sleep), etc.
…and lack of focus…probably the most crucial element of control.
Like the other guys said it depends on a lot of things. Did you lose command of fastballs as well? Missing high and arm side with them and then you’d miss low and glove side with off speed? If so there’s a good chance you’re rushing to the plate.