Always On Display issue in samsung s8 plus after Oreo update.

[Abhishek Rana4]

So, my samsung s8 plus doesn't show AOD after Oreo update. It works fine for sometime if i restart my device and again stop working after sometime. I even visited service center where they had reset my device and installed fresh Oreo update but still issue isn't resolved. Even lot of heating issues exist after the update.
Any suggesstions?
Poor service by Samsung. Really sad!!