More and more of the RNS510 look to be failing due to age; most have IDE HDDs.
Try reloading the firmware on the unit: Firmware updates for RNS510 units in Australia/NZ
And if that fails, an HDD replacement would be required. RNS-510 HDD replacement/SSD swap DIY
Many people are upgrading the units with something that has a current map and many more features.
Check out this thread for the top-of-the-line unit Discover Media retrofit
Also, the RCD 330 is a popular choice.
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