Radio sound drops out.

The after market radio/mp3 player is acting up, individual speakers drop out at random, if I go over a small bump, the whole radio can reset, sometimes just having to re-read the usb, sometimes triggering the NATS tones. Switch cleaner on the contacts at the back of the radio can help a bit sometimes, not permanently. I have twice tried new adapter leads from Halfords, but neither fitted. Any ideas or suggestions?
 
The fastest way to "close" this might be trying for a day with another unit with it's own loom or one that plugs directly to the car. If the issue is the car loom, the issue should persist. The thing will be finding one lol, do you have the original one?
 
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