If it's a modern radio with digital tuning and memory, there's two "power wires", one that gets powered on and off with the ignition switch, and one that needs to be connected to "always live" battery power.
If you don't get that correct, they will not function properly.
Also, they have "amplifier protection" circuitry, if they sense a speaker with less than required impedance (defective/shorted), or a speaker wire that is common with ground they will go into "protection mode".
I'd suspect one of those issues before condemning the new radio,
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