Few Microsoft Surface units which were sold initially came with faulty Touch keyboards and Microsoft replaced them for their customers. It seems few other devices are now facing faulty magnetic systems. As you can see in the video above, when keyboard is attached to the tablet, the tape along with magnets on the tablet gets attached to the keyboard due to the weak tape/strong magnet in the Surface unit.
As expected, Microsoft Support is replacing the faulty devices with new ones. So if your Surface faced similar issue, its time to call the Microsoft Support team.
Thanks Steve for the heads up.
Source: Microsoft Surface forums