I updated from 12.0 to 12.1.4, and my battery started draining faster. I skipped 13 and 13.1, but my battery issue started becoming pretty annoying. So finally I caved and updated to 13.1.2. Battery issue got better, but now I'm having a couple of annoying issues.
1. Randomly, I sometimes won't get any notifications when I receive text messages. I would get a banner on my lock screen, but the ringer and vibrate doesn't go off (I have it set to ring and vibrate for text messages). And sometimes, I don't even get a notification on lock screen, or a badge on the Messages app icon. But the new text message would be there. Again this is random, from any one in my contacts. Pretty annoying, especially when you are waiting on an important text.
2. Sometimes, when reviewing a video in Photos, I would get a black screen. I would then have to close Photos and relaunch. As well, when it comes to Photos, orientation gets mucked up. When viewing a landscape pic, it gets cut off like it was in portrait view. You have to turn you phone to portrait view, then back to landscape for it to correct.