after having command blocks down for awhile with command block coding the command block seems to be disabled (im not sure how to replicate just leave the server on and have no players join or be in that area maybe for a few hours or days idk)

It breaks in two ways:

one is permanent and you have to break the block to retype the code

the second one if the command block is still able to be used and it has needs restone just use a lever or a switch to give it a reset