This is an actual issue as myself and quite a few people have seen this since this update. I put my PS4 in the shop on Friday because of the same issue you are having. Over the past few days, I've seen articles in which we aren't the only ones seeing this message. I haven't seen any word on a Song fix for the firmware version 7.50 at this time (the one causing the SU-42118-6 error for me, you and others). I'm waiting but for the shop to let me know as I've updated them with the info I've seen online.