Serious instability on WRT1900AC

I read the different posts on this forum and other places, and unfortunately, it seems as if I don't have a good buy with this router.  As with many users, I had some problems to continuous speed of my router.  First of all, here is my network configuration:

1 ISP: Tigo (this is ISP in San Jose, Costa Rica)

2. router: changed their stock ARRIS router (DG950) to one that I bought (Motorola Surfboard SB6141 Arris). ISP use Docsys 3.0

3. acquisition of speeds: download 20Mbps, 2 Mbit/s Upload

4A bought this weekend AC1200 Wifi Extender

When it connects directly to the modem, I get speeds inside the ISP (18.9 Down, Up 2.0) threshold.  However when connecting either wired or wireless with (using the 5 GHz band to be sure just next to router), the speeds are in every sense.  In some cases, it will not yet over the ping test, and in others, it will get up to about 16 Mbps.  I'll get average is about 9-10 Mbps.  I bought this router specifically for speed and because what he is-wall (which unfortunately is not the Asus RT-AC68U) and I can not get anything coherent about this thing.

I also tried as some suggest doing a clean install of the latest firmware (not an upgrade) and it did not help.  I saw some people fiddle with the MTU, but I don't know what it is or where to start.  For any help or suggestion would be immensely appreciated, as I'm about to throw this thing in the trash (or see how I can return it for a refund).

Thank you.

You can also try this test to determine the appropriate MTU on your router settings: http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=fbf8e8564632422eaa8ea80bf9dcba64_386.xml&pid=80&re...

Tags: Linksys Routers

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