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I had this issue and found out it was because of the rear dash cam I installed.
After I install a front and rear dash cam system, the keyless entry was working intermittently and I had to put the key up to the steering column almost all the time. The key remote only worked about 1 foot away from the car also. I brought it to the dealership and they actually replace the CAS module but it was still finicky. I unplugged the read dash cam and voila, everything works fine as it should. Don't think the CAS module had to be replaced.
I don't know if the wire I ran along the top side of the pillars were interfering with signals and sensor of if the unit itself was interfering with the sensor located at the top of the boot. For me, I was able to isolate the problem and found the error. Could be some inference issues.
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