I’m thinking the problem is the gauge being used. What should happen is that the pressure is set above the “alert pressure”, and then the tire (and wheel and valve) will leak down at worse at 1 psi a month. In theory, the alert pressure is many months of leakage lower than the placard pressure (You know about the placard, right?).
You should also be aware that outside temperature will affect this. For every 10°F chnge, the pressure will drop 1 psi. This time of year, it’s possible to lose enough pressure overnight to trigger an alert.
Plus it is possible that the wheels are leaky - not at the tire/wheel interface, but through the alloy it elf.
Lastly, you probably ought to take the vehicle back to the dealer and have them check on this.