Welcome to the forums! Do you have the EZ track with the gray or black roadbed? In my experience trains run better on the gray roadbed track, as the rails are nickel silver, not steel. I've found most steel track to have issues in terms of being good conductors, if you don't run your trains 24/7.
I'm not completely familiar with EZTrack switches, however they should have some sort of a controller you plug the switch machine wires(three conductors) into. Are you trying to control the switches via DCC? If so, these next steps don't apply. These if these control boxes, can be attached together in a line, if they are like other systems. You then need to attach the two conductor wire to the AC/Accessory terminals of the power pack. To change the position of the switch, turn on the power pack, and slide the switch on the switch controller to the other position, for the switch you want to throw. If this doesn't make sense I recommend you do a search online for 'EZ Track switch wiring,' or such. If any of the wires are cut, the switch won't throw properly.