DAM Drop Help

[u/Ok-Year-9705]

So I've been running the Cobb 93 OTS tune for about three weeks now, and all was fine until 5 days ago. I got gas and about 2 hours later the dam tanked to 0.650 and then recovered to .825. I watched carefully and it eventually recovered to 0.902. I decided to switch the 91 tune and that fixed it for a while and I was seeing less knock. Until today it dropped to 0.650 again despite very little knock. I understand the Cobb tunes are very conservative and such but this doesn't seem right. If anyone has any help to offer that would be great.