Hard Time Trying To Wire 4 Switches
2 switches controlling a load is a 3-way circuit. 3 or more switches controlling a load is a 4-way circuit.
In your case, you need two 3-way switches, and two 4-way switches. One 3-way sw goes at the beginning of the 'run' and will have power enter and start the switch leg. The other 3-way will be at the end of the 'run', and the load will connect to it. The 2 4-way switches go between the 3-ways. Let us know how you have your circuit set up...what wires you have pulled, which box the source (supplying power) enters and which box the load enters.
Just because you can, doesn't always mean you should