I have a problem with fiducials missing on our FAB's when we receive  them from the vendor.  It is random and not specific to any one  assembly.
The boards are being HASL and this is where they are coming off during  fabrication.  The fiducial size is 0.040" circle ½ oz. Copper.  We  have other board shops that we use and I haven't had this problem.
Getting to the Question:
The board shop in question asked if we to increase fiducial size or  increase copper around fiducial.  I feel that this isn't the source of  the problem I don't feel that we are asking anything out of the  ordinary using 0.040" fiducial.  I would appreciate any suggestions in   this matter.
Thank you,

ADC
Scott Lefebvre
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