If I’m reading this correctly, you were doing a cut and lost connection. Now you are trying to use the go to button to start cutting where you left off but when you do this you get a error that says the sled is not keeping up with the expected position.
If this is the case, you should just have to hit play from the beginning… line 0. Your router will start moving to the first cut position. Hit pause before the z starts to lower. Now click go to and type the line you want. Or hit the arrows until you are at the part you want to cut. Then hit Resume.
Edit: This happens to me quite a bit. You may have to play with the line you are going to. Starting at the last z movement usually works best for me.