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I have the AC66U and started experiencing the same thing with mine.
The problem was mostly at night and on the weekends. I downloaded
from Google Play an app that will monitor radio activity by
frequency and channels. During the bad times I found a boatload of
other APs on all various channels so being more selective on channel
selection was not an option. With the app I was able to walk around
the house and it would indicate where my signal strength would fade
out and where it was exceptional. At this time my grandson informed
me that his iPhone was remaining connected to my AP as far as 3 to 4
blocks away. I went outside and di some more scanning and noticed
that the signal strength would peak outside and in directions where
it would benefit my neighbors or cause more interference for them
than it helped us. I then turned the router about 90 degrees and
re-positioned the antennas which helped but the back of the house
was still experiencing multiple dead spots. At the same time I
ordered some new replacement antennas and once installed 99% of
problems went away. If you want I could let you know which antenna I
got with specs and where I got them. <br>
<br>
<div class="moz-cite-prefix">On 02/18/2016 12:31 PM, Steve Tynor
wrote:<br>
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I'm looking for some brainstoming ideas to explain why my home
wifi router's performance is suddenly acting so strange:
periodically (about once a day), performance (as tested by
speedtest.net) drastically decreases from ~30Mb/s to ~4Mb/s.<br>
<br>
When this happens, there's nothing I can do to make it better.
Rebooting the router has no effect. The speed comes back when its
good and ready - not before. These "outages" usually last about
12 hours. Performance is bad from all clients - macbook, ubuntu
laptop, phones - so this seems to be router specific - not due to
client config.<br>
<br>
NOTE: tests via 10baseT wired connections are consistently at
29+Mb/s; wifi is 26-29 when good, when bad between 0.9 and 4Mb/s.
When the wifi is bad, the wired results remain good: so this is a
wifi problem - can't blame it on comcast :) <br>
<br>
The router is an Asus RT-N16 running Tomato/Shibby. Google shows
others getting much better throughput with this hardware/firmware
combo (70+Mb/s) so I don't think the router or firmware is likely
to blame (unless I have flakey hardware ?)<br>
<br>
I've been logging through a speedtest-cli cronjob for the past
week and 6 days out of 7, I see this behavior (performance
degrades starting between 9pm and 2am, continues even after the
router auto-reboots at 5am and then eventually returns to normal
by about 9am. <br>
<br>
Things I've tried:<br>
<ul>
<li>I cannot identify any equipment in the house that might be
causing radio interference - and certainly nothing that is on
a periodic schedule that matches these overnight outages. </li>
<li>Reboot the router - has no effect.</li>
<li>Checked that this is not client specific. When the
performance degrades, I measure the same throughput on all
clients (laptops, phones).<br>
</li>
<li>There is no load on the wifi during these outages (no long
running file transfers, backup rsync's or streaming).<br>
</li>
<li>I disabled bandwidth and ip monitoring (which I understand
to be a known bottleneck in Tomato). This improved the
"normal" throughput a bit, but has not solved the periodic
slow "outages".<br>
</li>
<li>I moved the router to a variety of locations (on theory that
there may be some unusual interference on one location or the
other)</li>
</ul>
<br>
I'm looking for ideas of more things to try before I reflash the
original firmware and see if Asus's software works better...
(followed by trash the asus and buy a new router :( ).<br>
<br>
Help! (and thanks,)<br>
Steve<br>
<br>
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