My lock button doesn't work from time to time. But then other times it works perfect
  
  My phone has all the latest updates, never been dropped, never been in water, had a screen protected and a case on since new.
  
  only had phone 3 week
  
  It does have a wireless card plugged in for wireless charging
  
  Please help as it's driving me crazy! 
  Read more: Lock button not working in Samsung Galaxy S5?