Your Astra should still be under warranty.
I would say one of the wheels has a faulty TPMS sensor.
How long has this fault been happening, and have you had the wheels rotated recently?
We always replace sensors whenever a tyre is removed, just to be safe.
Then program all the sensors, including the new one.
Breaking the bead of the rim generally risks damaging the sensor.
Was the tyre taken off to repair the wheel?
Do you need any further help?
I hope my advice has been of assistance to you.