locking errors

I am getting hundreds of these:

     0       1  ## procmail: Error while writing to 
"/var/spool/mail/_xxD+tWox9.gandolf"
      0       1  ## procmail: Error while writing to 
"/var/spool/mail/_yQG+xuwx9.gandolf"
      0       1  ## procmail: Error while writing to 
"/var/spool/mail/_yjD,SViu9.gandolf"
      0       1  ## procmail: Error while writing to 
"/var/spool/mail/_yjH%Kd3v9.gandolf"
      0       1  ## procmail: Error while writing to 
"/var/spool/mail/_ymB+m1Gx9.gandolf"
      0       1  ## procmail: Error while writing to 
"/var/spool/mail/_zH%JUcx9.gandolf"

in my mailstat logs.

help?
--
Nothing happens.


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