The increased volume of these types of requests puts you the professional on notice that the content of the will could be brought into question. It is then our job to inform your insurer of this as a potential claim.
As part of an effective risk management system, we would suggest that the clients own GP is asked to provide written confirmation that there are no signs of any deterioration or indeed a diagnosed condition which might affect the decision making before any work is undertaken.
Finally, should this develop into a formal claim, sometimes many years ahead, you could have a great defence!