Slow Wifi on ASUS RT-68AC on Huawei Android devices only, others run OK

[Ornitus]

Hello,

I have purchased new Huawei P8 Dual SIM (HUAWEI-GRA-UL00), My wife, has the similar P8, but not dual SIM - version GRA-L09.
We both have a problem with slow Wi-Fi (slow download - upload seems to be OK) on router ASUS RT-AC68U - on 2,4 GHz (5Ghz is not even seen on HUA - is not supported).

The speed often drops under 0,5Mbit/s and is not stable - also in LAN not only on Internet. Internet connection is optical with speed 100Mbit/s.
All other devices are running perfectly on router with no issue (3 laptops, other mobile phones, etc.). PC station runs via ethernet on 80Mbit/s Download and 20Mb/s Upload...


We tried also severeal other wi-fis and there our P8s work well (download speed up to 30Mbit/s).
Router has last Merlin Firmware (I also try to downgrade to original Asus one - with no success).
I tried several options change on router, inlcuding change of channels, bandwith, IPv6 disabling, firewall disabling etc., but with no success.

Any suggestion, what can be wrong?

 

[Ornitus]

Just quick response:
- I did facory reset on router, didn't change anything - just user name password and Wi-fi WPS2/Aes authetication - Problem solved
- Every day I switch on additional feature (Samba, openVpn...) - speed still looks fine
- when I tried to switch on "Download manager", suddenly speed drops rapidly down. CPU load on one core was between 80-100%, second over 50%, RAM utilization over 90%. It looks, like this high loads could be the problem. So be careful if you will turn on more features. The speed of processor, and RAM is limited.

 

[Puppa]

Just turning on the download manager feature slowed it down? Or did you try to download a file? After that, slowdown was forever? Sounds like something got corrupted, but the factory reset should have cleared it. This question should be in the Merlin Subfolder, but maybe @RMerlin will see it here.

Sent from my SM-N920V using Tapatalk

 

[CCNnorthcali]

I also have two GRA-L09 phones in my household. Turning off TX Bursting has helped a lot.