[opensuse-factory] Failing to load luks unlock screen on bootup occasionally

I have been getting increasingly frequent failures to load the luks unlock screen on boot-up. To circumvent the issue, I have been restarting opensuse until it boots properly. I have an Ubuntu drive which does not experience the same booting issue, so it is probably not faulty hardware. I am trying to see what's wrong with the boot process that is causing these occasional failures, but the /var/log/boot.log file begins with:

%G(K%G(K%G(K%G%G(K(K[ OK ] Found device /dev/mapper/ cr_ata-ST2000DM001-1CH164_W1E8K3N6-part1. [ OK ] Started Cryptography Setup for cr_ata- ST2000DM001-1CH164_W1E8K3N6-part1.

Any suggestions on debugging this problem?