[Nexus 6P Q&A, Help & Troubleshooting] EnF70:
This issue only happens after some time, I haven't been able to properly identify the right conditions but a few possible triggers could be:

- connecting to another Wi-Fi and then coming back to home Wi-Fi network

- after overnight doze, in the morning

Hardware:

Nexus-6P with 6.0.1, Asus RT-AC87U with latest original firmware or latest Asuswrt-Merlin firmware (latest before 31.12.2015)

Verification:

ping your Nexus-6P from the local network, if you see ping times of around 2 seconds then the issue is there.

admin@rt-ac87u:/tmp/home/root# ping nexus-6p
PING nexus-6p (192.168.10.105): 56 data bytes
64 bytes from 192.168.10.105: seq=0 ttl=64 time=2.917 ms
64 bytes from 192.168.10.105: seq=1 ttl=64 time=1083.146 ms
64 bytes from 192.168.10.105: seq=2 ttl=64 time=83.068 ms
64 bytes from 192.168.10.105: seq=3 ttl=64 time=2098.707 ms
64 bytes from 192.168.10.105: seq=4 ttl=64 time=1098.448 ms
64 bytes from 192.168.10.105: seq=5 ttl=64 time=98.510 ms
64 bytes from 192.168.10.105: seq=6 ttl=64 time=945.520 ms
64 bytes from 192.168.10.105: seq=7 ttl=64 time=104.417 ms
64 bytes from 192.168.10.105: seq=8 ttl=64 time=113.390 ms
64 bytes from 192.168.10.105: seq=9 ttl=64 time=3.880 ms
64 bytes from 192.168.10.105: seq=10 ttl=64 time=41.111 ms
64 bytes from 192.168.10.105: seq=11 ttl=64 time=2083.710 ms
64 bytes from 192.168.10.105: seq=12 ttl=64 time=1083.688 ms
64 bytes from 192.168.10.105: seq=13 ttl=64 time=83.582 ms
64 bytes from 192.168.10.105: seq=14 ttl=64 time=2155.097 ms
64 bytes from 192.168.10.105: seq=15 ttl=64 time=1155.053 ms
64 bytes from 192.168.10.105: seq=16 ttl=64 time=154.946 ms
64 bytes from 192.168.10.105: seq=17 ttl=64 time=1921.035 ms
64 bytes from 192.168.10.105: seq=18 ttl=64 time=920.965 ms
64 bytes from 192.168.10.105: seq=19 ttl=64 time=3.532 ms
64 bytes from 192.168.10.105: seq=20 ttl=64 time=1991.599 ms
64 bytes from 192.168.10.105: seq=21 ttl=64 time=991.523 ms
64 bytes from 192.168.10.105: seq=22 ttl=64 time=3.394 ms
64 bytes from 192.168.10.105: seq=23 ttl=64 time=2063.511 ms
64 bytes from 192.168.10.105: seq=24 ttl=64 time=1063.289 ms
64 bytes from 192.168.10.105: seq=25 ttl=64 time=63.159 ms
^C
--- nexus-6p ping statistics ---
26 packets transmitted, 26 packets received, 0% packet loss
round-trip min/avg/max = 2.917/823.507/2155.097 ms

Testing:

1) Running OOKLA speedtest at http://www.speedtest.net shows no degradation in speed (compared to 2.4Ghz or 5Ghz before the issue)

What's more, the ping during the OOKLA speedtest shows a very stable 3ms for the duration of the test.

2) Streaming video over Plex (local network), Netflix (from Internet), streaming a movie from a local Samba/CIFS share is fine.

Same thing, ping is stable and low (around 3ms) while Nexus Wi-Fi is busy streaming content.

3) Streaming LIVE TV from a local Enigma2 satellite receiver is NOT stable.

The high ping latency breaks the streaming and the video is jerky, stops frequently and shows signs of degradation (low fps and image decompressions artefacts).

The ping varies a lot during this type of streaming and it shows response times of 2 seconds similar to the times shown above.

The type of streaming is RTP over HTTP from a Live TV source (the normal Enigma2 streaming). My sat receiver is a Vu+ Duo2.

I have tried both HD and SD TV channels with normal streaming (not transcoding) as this requires a low latency network to stream properly.

I also have tried various video players on the Nexus-6P like BSPlayer (both software and HWacc), MX Player and the internal video player of the VU+ client.

Notes:

1) The issue doesn't happen on 2.4Ghz (same router) I have tested it for a week, everything stays stable on 2.4GHz

Ping times over 2.4GHz vary between 3ms and 300ms but nowhere near the 2 seconds observed on 5GHz

2) The same LIVE TV streaming (same source, same players used) works perfectly over 2.4GHz (same network, same router, same everything) and on 5Ghz before the issue appears (high ping latency).

3) Rebooting the Nexus-6P changes nothing, after reboot the 5GHz high ping issue is still there

4) Rebooting the Asus RT-AC87U router solves the issue, everything works fine until the issue surfaces again

Before blaming the router, I have other 5Ghz Wi-Fi devices on the network (Samsung S4, HTC One M7, MacBookPro, iPad Air, Samsung TabS) and they all work fine, no issues streaming Live TV on them from the same source.