Since it's a file or device node in /dev, it's probably being (re)created by udev every time the system boots.
You'll have to create a new udev rule (or edit an existing rule) to make sure the file/node is created with the required permissions. These rules reside in a directory called rules.d somwhere on your system, and its location varies between distributions. On my system, user-defined rules go in /etc/udev/rules.d.
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