Radio volume

Good evening I have a 2003 l322 Diesel I have volume for approximately 30 seconds then no sound if I turn off the radio and then turn it back on I will get sound for approximately 30 seconds I have replaced the amp in the boot and radio head in dash and it’s still the same can anyone give me some advice on this please

it’s an LR. Maybe it doesn’t like your music choice?

Get yourself a MOST bypass loop and bypass each module (other than the IHU & amplifier!), cycling the ignition each time to find the guilty module. - otherwise, it's possible the steering wheel controls are causing it - disconnect them and see what happens (or doesn't).

Thank you