Hi Randy,

 

RBI's of recent vintage come with a long metal rod that attaches to the top of the stand and extend vertically to contact the bottom outside edge of the table to prevent this.  Apparently this must be a chronic problem with the saws and the rod idea is an attempt to prevent shifting.  You might be able to try the same thing with a length of 1/4" all thread if there is a hole available in the top of the stand that is in a convenient location.   

 

My first RBI had the same problem occasionally, and I just tried to be careful not to put too much pressure on the table.  My new one has the rod thing and I don't have a problem with it. 

 

Good luck,

Bruce