Keyless entry works, but fails to lock the car.

[WallyBazoom]

My Superb is fairly new to me and it has always opened and shut using keyless entry. But over recent days it seems to only open and need to press the key to lock the car. I've tried with all 3 keys and it's the same. Every now and then it does seem to work, by like 1 in 20. Has anyone seen this before or have any suggestions? Thanks.

[BTandSid]

Perhaps the fob batteries are dead/dying? 

[WallyBazoom]

Thanks, I have ordered new batteries, but it would seem odd with all 3 keys being the same.