Rule Definition
The EXECUTE IMMEDIATE statement prepares (parses) and immediately executes a dynamic SQL statement or an anonymous PL/SQL block. Each repetition of the same dynamic SQL statement incurs a soft parse, which is a small overhead compared to a static statement, but still an overhead. The overhead of execute immediate is small, it can be in the thousandths of a second - however, it can add up if this is inside a loop / on a method called once per object.

Remediation
You should replace the dynamic SQL statements through different static statements.