No, it is not random. The freeze happens to me every time I try to install a system with encrypted disks.
As mentioned in here, I want to create a installation with a boot partition and a partition for LVMonLUKS where the root and home partition are inside. The LVM is created before the startup of the installer and in the installer I am using the option manually partitioning.
The installer freezes at the step installing time zone data or right after that step.