Error frm-93652 Forms 12.2.1.3 - Suddenly and random

Hello,

we have am Oracle Forms and reports installation rel.12.2.1.3 with more then 500 forms and reports.

Everything worked fine but suddenly and without updates any clients have program interruptions with the error FRM-93652.

After they enter again in the form and all works fine.

This for 40-50 times in a day , not for all users and always on the same forms (no more than five .fmx), this from three days (nothing in the previous six months).

For other forms there are never interruptions.

On the server , in this path " H:\Oracle\domains\base1\system_components\FORMS\forms1\trace" we find some dum file like frmweb_dump_5564 one for each program break.