Anybody getting a low tire pressure false alarm?

Maybe it has to do with the cold weather, but the alarm usually goes away a few minutes after I turn on the ignition. The tire pressures are within normal range, so it's definitely a false alarm.
This morning I even got a "very low tire pressure" warning message, but it too disappeared soon.
Should I just ignore these false alarms or is it telltale sign that there is a problem with the elctronics system?