It's not normal and most likely the result of one of the TPMS units going bad. If the battery inside goes dead, that individual tire unit will not report and the TPMS warning light comes on. Or it could be the unit itself went out. In any case, if your Z is under warranty, the dealer should fix it. If not, try a tire dealer who has a TPMS reader- they might be able to figure out which unit is defective.
BTW- the TPMS unit is set to go on when 28 PSi or less is detected.
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