Hi,
Is this issue intermittent or the pings are never working ?
If it is intermittent , you would have to check if the pings are even reaching the ASA device interface and that should be able to isolate the issue to the ASA hardware.
You can apply a simple capture on the Interface that you are testing with:-
capture cap interface <Name Of Interface> match icmp host <Interface IP> <Test PC IP>
capture asp type asp-drop all
Also , collect the show tech at that time of the issue and we should be able to verify the issue.
Is there a Layer 3 hop or another Layer 2 Switch connected between the client and the ASA device ?
Thanks and Regards,
Vibhor Amrodia