Just put a new clarion vz401 in my 01 land rover discovery. It worked great on a couple 1 hour trips. Then on day 2, after running the engine about 5-7 minutes, it would start slowly building an increasing background hiss which after another 2 minutes or so gets super loud, and then won't even stop unless I fully mute the audio. The buttons also become less responsive and eventually stop responding. The unit eventually resets itself after a few minutes of this. It doesn't matter what mode I'm in. When in this failure mode, it's very sensitive to any other electrical noise in the car like lights and wipers. Also, if I run it without the car on it seems to work fine indefinitely.

It sounds like an internal problem, especially since the touch screen stops functioning.
So some thoughts, if it's not an internal failure: I also have an axxess aswc1 for the steering wheel buttons. I also have a wireless backup camera receiver sharing the power and ground of the stereo. The stereo is only using the harness ground at the moment. I did disconnect the camera and aswc with no change, however they were still power wired in.

Also the unit never feels hot at all.

I have a new unit coming on warranty, but I don't want to install it if I am doing something that might break it.
TIA

 

it sound like where you took the power source from is wrong....take it directly from the main fuse box... and check the ground wire as well for proper contact . (should be on a solid part of frame where there's no paint )... start with that and we will go forward accordingly .