Both of my key fobs have stopped opening/locking my Astra J ST. I've tried resyncing, but nothing happens, as if there's no signal, but it's unlikely that both fobs would go at the same time so I doubt it's the batteries and it's not external interference because it happens everywhere I park. Using the key in the door only unlocks the driver door, but when I lock it, and other doors are unlocked, it locks them all. The button on the dash still works to unlock/lock all doors, so I don't think it'