2014 Nissan Rogue - Electrical issues

when car is cut off,the tail lights will come on for a few seconds and then go off and come back on and the doors will unlock.sometimes it won’t start.

Clearly you have a problem that needs fixing. A problem that cannot be diagnosed over the internet, especially with so little information. Take it to a well rated independent local auto repair shop. Expect to pay them for time spent diagnosing your problem. Try to give them more info than you did for us.

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The vehicle may have a BCM that’s starting to fail.

Tester

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Tail lights can turn on and off with vehicle parked, keys removed, b/c of a faulty brake light switch. Doesn’t seem like that would explain the door issue or the won’t start problem. By “won’t start” do you mean fails to crank – that rr rrr rrr sound with key in start? Or do you mean it cranks ok, but won’t catch and run?