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You connected your blue alpine wire (power antenna) to your blue wire (amplifier remote on) on the BMW harness adapter. You need to undo this, amputate your blue alpine wire (because your E36 has no power antenna) and connect the alpine blue wire with white stripe (remote power) to your blue wire on the harness adapter.
When you switch source from the radio, alpine is shutting off your amplifier through the connected power antenna wire. Since you're not listening to the radio anymore, it sees no reason why it should give it power.
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