that symptom sounds EXACTLY like insufficient or improper bedding
HOWEVER
I did experience a different issue on my IS300, which is equipped with aftermarket Racing Brake calipers. They used a modified subaru WRX pad which didn't QUITE seat properly, so re-bedding only provided temporary relief. After going back and forth with FIGS (designed the kit), we had to modify a different pad, which ultimately solved the issue.
I suspect that you are not going to need to do anything so drastic as you are using OEM calipers and rotors instead of some cobbled together aftermarket kit
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