Custom Columns in Portfolios

I am looking to see if anyone else has created customs columns in the Portfolio screen.  I have recently add some new fields at the request of our gift officers. I add fields like  "Last Gift Date" "Gift Amount this FY", etc. Each column works fine on it's own, but I am, finding when I add multiples of these columns.  Other users and myself get the following error message. 

I suspect either my SQL queries in TR CUSTOM PORTFOLIO  ELEMENTS  are inefficient or there is a limit to the number of columns. 

Has anyone seen this issue? 

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