If the Pi4 detects low voltage then it generates messages. Check the log for USB errors (use e.g. dmesg). It could also be that your USB C cable you use while operating at 2.1a is too thin. You can also crank down the Tx power of your internal antenna to save a watt or two.
I use a 12v to 5v 4amp buck converter too. I tried running at 2.4 but even that 'high' it was still sensitive to 100-200mah voltage change.
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