Alias is not stable

Dear Board,

We are using power supply unit from Lambda connected to COM port 1. In NI MAX we have aliased it as Lambda instead of COM 1.

It is for an End of  Line system . so the PC runs at Max 18 hours a day..

The Alias name is not consistant. It some times renames it self back to COM 1. So what could be the possiable reason for that ?

And how to resolve it ?

Thanks and Best regards,

Sarat