How to reproduce:
1. Open the attached project
2. Run Render Texture scene on Android device
3. You can play the second video, as quality of the video is better and the issue is more clear
4. While playing repeatedly click pause (||) button and play (>) button
Result: notice that video and audio get out of sync

Reproducible: 5.6.2f1 , 2017.1.0f2, 2017.2.0b1

DUT(reproducible):
69, Meizu MX4, OS 5.0.1, PowerVR, MediaTek
12, HTC One [PJ4610000], OS 4.2.2, GeForce, NVidia Tegra
42, Samsung Galaxy S III Mini VE with NFC, OS 4.2.2, Vivante, Marvell

DUT(not reproducible):
74, LG G5 [LG-H850], OS 6.0.1, Adreno 530, Qualcomm Snapdragon 820
69, Meizu MX4, OS 5.0.1, PowerVR, MediaTek
137, Samsung Galaxy S8 [SM-G950F], OS 7.0, ARM, Exynos 8 Octa

Videos:
Groot_H264_AAC_176x144.mp4,176x144,H264 avc,Baseline@L3.1,12,61.8 kb/s,AAC/LC,2,24.2 kb/s,44.1kHz
Groot_H264_AAC_480x360.mp4, 480x360 H264 avc Baseline@L3.1,30,545 kb/s,AAC/LC,2,129 kb/s,44.1kHz
Groot_VP8_Vorbis_320x180.webm,320x180,VP8,30,185 kb/s,Vorbis,2,112 kb/s,44.1kHz
Groot_VP8_Vorbis_640x360.webm,640x360,VP8,30,651 kb/s,Vorbis,2,112 kb/s,44.1kHz

NOTE: issue can be seen the best with lower resolution videos