So here's an odd one for you all, I'm still making content and doing little jobs on my 07 Mk2 ST pfl with 1st gen keyless ignition (the one with the key built into the ignition), and a few weeks ago I repaired a faulty wiper motor relay on the body control module, then a wheel speed sensor on the N/S rear wheel, and a couple of days ago I re-soldered the pins on the back of the cluster, as occasionally I'd either lose the display, or it would do something random, but here's the thing. The car was fine for a day, but now it's doing something really odd with the central locking.

Both key fobs work with the car, but if I lock the car with either remote, and return within 3 hours, I can unlock the car, and all is good.

If I lock the car with either fobs and return to the car after 8 hours, everything is fine.

If I lock the car with either of the fobs, and leave it for 12 hours, I can't unlock the car with either either of the fobs, but oddly I can open the door, just by pulling the handle, but the alarm sounds. I can't switch off the alarm with either of the fobs, or by turning the ignition key to on, I can even start the car and drive it around with the siren going off and the indicators flashing. I then have to disconnect the BCM to switch the alarm off.

IF - however I leave the car to auto lock, and walk away, it doesn't matter if I leave it for a day or two, I return, use the key fob to unlock the auto locked car, and can carry on as usual.

The car runs fine, boost fine, changes gear etc all fine ?

It's almost like if the car goes into a deep sleep with me locking it with the fob, and it forgets the key fob. I've not looked at the receiver in the N/S back of the car, but it's just such an odd one.