Device: 2017 MBP 13' TB (512GB SSD). (Less than 1.2 months old). Background: Wife started noticing Arq Backup reporting files missing with Chrome Browser when attempting to do backups. Then Chrome started losing profile information, then iMessages lost all messages, stuff wouldn't load. So I decided to do a first aid and it said I had to boot into recovery to do so. So I did and got this: So, wife backed up her data, and I erased the partition, formatted it with APFS Encrypted, and reinstalled Mac OS. First Aid shows 100% fine now. Wife is setting up laptop again. Anything we should be worried about? Everything seems fine now. Bing'ing the problem "System Check Exit Code is 8" seems to just recommend formatting partition. So we did.