Blind Spot Detection problems of the 2023 Subaru Forester

On January 3, 2024, my Subaru Forester suddenly lost emergency safety features such as the blind spot warning system. Many warning messages flashed on the screen as I drove north on rt 1 and the blind spot warning system was totally disabled. I believe that other safety features were likewise disabled, as well. I was upset as I had traded in my 2015 Forester because it lacked those safety features that in my new car had abruptly just stopped working! I drove my car to the concordville Subaru dealership for diagnosis and repair. I was told that the tech found error code p0455. The tech also found that the gas cap was secured and he reset the code and test drove the car. The error code did not re-occur upon test driving the car. I was told that that error code meant that gas fumes had escaped from the tank and that, when that occurs, all safety features are disabled. As my gas cap was secured that explanation seemed very weak to me and I asked how that explanation could be correct. I was told that Subaru could do a "smoke test" to ensure no leaks of gas fumes. I was given a loaner car and the test was done and no issues were found. As my car was running fine, I took my car home. I am writing this complaint over a year past the incident because I have now had a second incident, different in detail, but I am fearing some major problem with the car. I will write a complaint regarding the second incident which occurred on January 5, 2025.