welcome @Sea shells.
I assume the blades are slipping out of one of the clamps while cutting. it could be possible you are applying too much pressure on the wood when feeding it into the blade. if you're cutting and let off pressure on the workpiece, if it kind of springs back towards you, that is typically too much feed pressure on the workpiece into the blade.
you can also wipe the ends of the blades off and scuff em up with some sand paper to help the clamps grasp the blades.
you can also roughen up the end of the set screws in the blade holders,too. I use a nail file, stick it in the blade holder, and turn the clamp in while moving the nail file up and down until the blade screw clamp rubs against it. just a couple scrokes to roughen up the surface a bit