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What might affect a magnet's strength?

The factors can affect a magnet's strength:

Heat
   
Radiation
 
Strong electrical currents in close proximity to the magnet
  
Other magnets in close proximity to the magnet
  
(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.