Hi There,

i have some trouble with my TL-WR940N Router. 

I got a macbook 2012 connected via LAN and if i´m starting a speedtest i got about 100 Mbits.

If i´m using the WLAN with the mac i still got about 70 mbits, which is ok for my needs.

But when i'm using my Android phone, my Iphone or my iPad pro, the speed varies a lot. 

Sometimes i got about 12 Mbits, sometimes 1 Mbits. But often i only got about 4 Mbits.

All the time the Pictures and Videos are starting very fast but then after 2 seconds they stop.

I tested: 

Changing the LAN-Cables

Changing the position of the router

Changing different Channels

Changing Channel width... 

Nothing seems to help.

Could anyone help me here? 

I´m very happy to recive any tip or advice

Many thanks for your help

Best Regards

Felix