Electronic issues with no warning lights

So I think I got mine resolved week before last. I was checking other ground connections and on a whim, thought I'd put a wrench on the battery terminals. The battery was brand new when I got the Tahoe 10 months ago, so I never gave it a second thought. However, it did look like the negative terminal wasn't fully seated on the post. Well, it didn't take much effort to loosen the bolt and I got the terminal down another 1/8-3/16. The positive side was about the same, so I took the negative off and started on the positive side. Welllllll.....it wasn't even tight! I pulled it off, cleaned up, added some dielectric grease and made sure the terminal was FULLY seated. I did the same for the negative side. It's been two weeks and NO ISSUES!