volvo s 80

First time here, so I hope this is a right thread.is there anybody who can give me advice on the central locking mechanism.My Volvo will lock three doors with the fob leaving the drivers door unlocked. but sometimes all the foor doors are locked with fob . sometimes the fob will not work on any of the doors and I have to use the key. could it be the central locking activator or any other sugestions what it may be.
P.S. I have two fobs both good
 
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