[thelist] Majordomo problems....

I have Majordomo currently setup on one of my sites as an announcement only 
list.  Occasionally, keyword occasionally, posts that I send to my lists 
are bounced back to me with the subject "Admin request of type 
/\bunsubscribe\b/i at line 1".  There has been no changes to any of the 
configuration files since it was setup.  It will often go for weeks with no 
problems, then I can't post.  Don't know why.  I have my email address in 
the listname-post text file.  The permissions have not changed.  I give it 
a week or two, it works again.  Go figure.

Has anyone had this problem before?  Any ideas on what causes it and how to 
fix it?

Thanks

CDitty