Intel 6250 lost connection

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Hello

I manage to connect to YOTA network successfully, and then start dhcp, but
after a few minutes connection is lost. It is a reproducible error. I used
different dhcp clients: dhclient and dhcpcd. Only dhcpcd outputs error wmx0:
carrier lost.

Chip: Intel 6250
Distr - Gentoo x86
Connect to YOTA (step by step):
1) wimaxd -i wmx0 -d
2) wimaxcu ron
3) wimaxcu connect network 21 (Connection successful)
4) dhclient wmx0
5) ping works and ifconfig output:
wmx0      Link encap:Ethernet  HWaddr 00:1d:e1:2f:d8:55
          inet addr:10.117.31.207  Mask:255.255.248.0
          UP RUNNING NOARP  MTU:1400  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:20
          RX bytes:672 (672.0 B)  TX bytes:664 (664.0 B)

6) but after a minute ping does not work and ifconfig output:
wmx0      Link encap:Ethernet  HWaddr 00:1d:e1:2f:d8:55
          inet addr:10.117.31.207  Mask:255.255.248.0
          UP NOARP  MTU:1400  Metric:1
          RX packets:2112 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1851 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:20
          RX bytes:8592400 (8.1 MiB)  TX bytes:184321 (180.0 KiB)

I tried kernel 2.6.36 and 2.6.37:
config:
-*- Networking support  --->
    <M>   WiMAX Wireless Broadband support  --->
    <*>   RF switch subsystem support  --->
Device Drivers  --->
    [*] Network device support  --->
        WiMAX Wireless Broadband devices  --->
            <M> Intel Wireless WiMAX Connection 2400 over USB
            <M> Intel Wireless WiMAX Connection 2400 over SDIO
            [*]   Intel Wireless Multicom WiMAX Connection 3200 over SDIO
            (8) WiMAX i2400m debug level

Installed apps (there were no errors during compilation):
1) wimax-1.5.1
2) wimax-tools-1.4.4
3) wpa_supplicant-0.7.3 patched
4) i2400m-fw-1.5.0

I attached logs according to the instructions in FAQ (there are some errors)
I hope for your help.
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