Which factor affect a magnet's strength?

Magnet's strength affect by more factors,just main detail as following

1.Heat
    
2.Radiation
  
3.Strong electrical currents in close proximity to the magnet
  
4.Other magnets in close proximity to the magnet
  
5.(Neo magnets will corrode in high humidity environments unless they have a protective coating.)

Shock and vibration do not affect modern magnet materials, unless sufficient to physically damage the material.