RT-N66U reset with Huawei E3372s

[jaros85]

Hello everyone.
I have my ASUS RT-N66U with merlin firmware 380.68
In USB I have Huawei modem E3372s HiLink
When I set dual wan as a load balancing, router is rebooting when I more saturate my internet connection.
The same problem is with failover mode with E3372s

I test loadbalancing with Huawei 3131 and everythink works fine.

 

[jaros85]

Is anyone know about this problem ?
I have another E3372 (t version) also HiLink but there is the same problem but less often.