Clarion nx605 keeps freezing.

[Please help]

I have a clarion nx605 that keeps freezing when it turns on. I've had it for a few years with minimal issues. It starts normally, with the opening white screen, followed by the black clarion screen. This is where it locks up. After about 5 minutes it will restart itself and repeat the process. Every now and then after a few restarts, it will randomly start up normally and work. You can also tell when it will lock up during start up because the buttons on the face of the unit will not light up. I don't know much about car audio at all, any help would be appreciated. Thanks.

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