Too me Oreo has been a pain in the backside. The biggest change I have noticed has been battery life and the serious decline. Prior to Oreo on a good day (a really good day) I got 12-16 hours. But normally I got 8-12 hours. I installed Oreo and suddenly I am getting 9-11, then 8-10 and then it dropped 6-8 and then a few weeks ago I was getting 3-6 hrs. I factory reset a dozen times, ran the phone with the only apps that came installed didn't down load anything from the play store or install the LG bloatware apps. I checked battery usage and nothing seem to help. The battery issues has been only one problem. Apps crashing, phone freezing up, screen going dark, phone shutting down or weird message such account not found or can not connect with Google are other issues.
I factory reset about a month ago and I am back to 12+hours a day (only because 8-10 hours my phone is off because I am working (driving)