Steps to reproduce:

1) Download attached 'Android Video Error.zip' project and open in Unity
2) Open 'Test'scene and press Play
3) Drag the slider upwards
Note that video is not playing

Expected result: Dragging slider upwards should start video playback(check attached video 'expected.mp4')
Actual result: Video is not playing when slider is dragged upwards (check attached video 'actual.mp4')

Reproduced with:
2017.1.0b4, 2017.1.0p2, 2017.2.0b4, 2017.3.0a1
Using windows machine + PC, Mac and Linux Standalone Module
Using windows machine + Android Module
PC Standalone build
Google Pixel XL*, OS:8.0.0, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:google/marlin/marlin:O/OPP2.170420.019/4021594:user/release-keys

Not reproduced with:
5.6.2p4, 2017.1.0b1, 2017.1.0b3
Using windows machine + PC, Mac and Linux Standalone module
Using windows machine + Android module

Regression since:
2017.1.0b4

Note1: works as expected using Mac OS machine with all versions of Unity
Note2: works as expected on iPhone 6S iOS11.0 beta 4, Xcode 9.0 beta 4 with all versions of Unity

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Fixed in: 2018.3.0a1