ADG884 channel mismatch over voltage and temperature

My customer is using the ADI ADG884, but is having issues with the channel mismatch over voltage and temperature.  He needs a

a “low On resistance” analog switch that operates at 5V; which also has milli-ohm channel matching.

Is there a part that is better suited than the ADG884 or is there some way to overcome the channel mismatching of the ADG884 or could my customer potentially be doing something wrong with his implementation?

Thank you,