I know this is an old thread...but similiar event happened to me after taking the ATT OTA update on 6/22 on a Stock S8+. Update went as normal and optimized apps then stuck on open lock and circle screen...after about 3 minutes goes back and optimizes apps and then back to open lock. Wiped cache...same thing flashed stock firmware via Odin 3 3.13.1...same thing I'm still hopefull the Samsung repair at Best Buy has a trick up their sleeve so I don't lose all my pictures...etc... The only thing I haven't tried is a factory reset...but again...don't want to lose the data if there's any possible solution. Another weird thing happened 2 months ago...after taking another OTA update from ATT...the phone stopped recognizing my micro SD...because it was encrypted. After that update, the phone thought it was encrypted on another phone (it wasn't)...another loss of pictures/videos of my kids...not very happy with Samsung right now.
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