I have been using one for almost 15 years. I use it for backup now and only occassionally. I did have some issues with the operating system freezing and occassionally rebooting for no reason several years ago. I did contact Raymarine. I don't recall all of the details other than downloading a file they sent me on to a compact flash card and letting it run on the device. I believe it was a BIOS upgrade or something similar. All has been well since.