WiFi router TPLINK WR3040 + Yota - how to fix a broken connection?

Question

Yota

Hello!
I got myself a WiFi router with support for Yota adapters to distribute the Internet via WiFi at home and on the road - I got tired of sticking adapters and modems every time. The hardware is as follows:
* router - TPLINK WR3040
* Yota adapter - LU 150
* WiFi consumers - laptop with Ubuntu 12.04 / Iconbit tablet with Android 4.2
"Warmed up" the router's battery in several passes, connected it to the laptop via a patch cord, in the web-muzzle router on 192.168.1.1 set up the distribution of Yota's Internet via WiFi (I used the good QuickStart wizard of the web interface), set the password and rebooted the piece of iron. I plugged the Yota adapter into the router, found a WiFi point with a laptop and a tablet, connected - cheers, it works.
However, after a day of operation, the Internet began to work unstably when downloading large amounts of data. For example, when watching a video, after 1-2 minutes of operation, the download stops, the WAN indicator of the router turns off or is on without blinking (data is not being transmitted), the WiFi indicator is blinking (data is being received), in the tablet / laptop it shows that WiFi is ok, the indicator on the Yota adapter lit. After a few seconds, the WAN indicator of the router lights up again and is lit without blinking (the Internet is available, ready for use, data will not be transferred). The search query in the next browser tab passes, reloading the page with the video too. The original video "hangs" and does not load further.
The same happens when uploading files of several megabytes. At about 5-6 MB, the download stops and does not continue, without network errors, etc., the WAN indicator also goes out for a while and lights up. A 4 MB file loads correctly, which seems like a data limit per http session (although this is just my amateurish speculation).
Internet radio also works intermittently and requires manual reconnection to the station.
Directly Yota with a laptop and tablet works stably.
The quality and speed of the Internet in the first 1-2 minutes when working through a router are the same as when connecting the Yota adapter directly, of course, if you download large files / watch videos. Web surfing works without problems.
At first, I sinned on the high battery power consumption by the Yota adapter, but the same thing happens with a fully charged battery and even charging is connected.
What could be the problem? What do I need to configure in the router?

Answer 1

Install OpenWRT

Answer 2

An attempt to flash through the web interface failed (I did everything according to the instructions ). The router turned into a piece of brick. As soon as I get my hands on it, I’ll try to restore the factory firmware - so far I can’t do it quickly , because the router has stopped raising the LAN to control itself - and then flash the console through the U-Boot from the same instructions. Despite the curvature of the hands, it's a shame that when buying a device, you still have to dance lezginka with it.
On the other hand, it's more interesting :)