To diagnose a problem with the port, try using a different battery and cord for a while. Damaged Power Cord. The power cord is a wire inside a plastic sheath, and the wire can break with or without damage to the sheath. If the power goes on and off as the cord is moved or bent, the wire is likely broken.
You can work out if you're sore. Don't exercise the same muscle groups that are hurting. Do legs one day and exercise your upper body the next. By doing so, you'll still be able to get exercise and allow your lower body to recover and rebuild.
One thing is for sure, it can be taken before a workout to prevent the worst of the muscle soreness. One final thing you can do to help prevent muscle soreness is to perform static stretches right after your workout (while drinking your PWO shake) while the muscles are still warm.