What year is it?
If it's a facelift with HB11 bulbs, then it's normal for them to fail in pairs.
Unfortunately the bulbs overheat inside the headlamp casing. Lots of FL2 facelift owners change the bulbs to HID, adding more light and lengthening the life massively.
If it's a pre-facelift with H7 bulbs, then they can also fail in short succession, but life is better than the facelift headlamp.
Voltage is completely normal for a modern vehicle.
