Why Is This Door Lock Burning Up?

I have replaced Cisa locks on a door, multiple times every 20 - 24 days. It burns up on the back and looks like this:

We provide power to the lock from a power supply adapter desktop style 12v 5A. We use 2 REX normal press switch for that door.

We do not have any other issues from the rest access control system in this building, only this door.

It is the only door with this kind of lock because is the entrance door and it’s 2 pieces.

No REX or power supply or other devices have trouble.

Any ideas on what the problem is?

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