Hello I would really need your help please. Since some days I have a mysterious problem here. I am running an Asus RT-AC3200 with Tomato Shibby 138. My Internet connection is 80 MBit/s download and 20 MBit/s upload. Until some days ago I was able to reach nearly that values at speedtest.net on all my LAN + WLAN devices. But since 5 days or so, only LAN wired devices does reach that values. All WLAN devices now only reach 30 MBit/s download and 20 MBit/s upload. But I did not change anything and my WLAN speed locally is good (I am able to copy files over WLAN at around 45 MB/s -> ~360 MBit/s when I am around 1 meter away from my router). I tried it with a MacBook Air (early 2014, 802.11ac) and an iPhone 7. I tried on both 2,4 GHz and 5 GHz and same problem. My WLAN channels are not really crowded (I also used InSSIDer to find free, none overlapping channels). I also put a 30 meter Cat.6 cable from my DSL modem down to the cellar and created my test WLAN with my Asus RT-AC3200 (and also a Linksys E900) there (where not even one other WLAN appears). Result: Same problem, I get only 30 MBit/s internet download over WLAN. When I plugin the network cable I get 70 - 80 MBit/s. I also erased NVRAM completely, flashed router, tried only with basic, necessary configuration and also tried Asus stock firmware. Result: Same problem. I don't think, that my iPhone and MacBook are broken or too slow, cause they also get very good speeds locally in WLAN. It seems as if not the WLAN is the problem. The only problem seems to be WAN -> WLAN. But what the hell could that be, that my router(s) can't get more throughput from WAN to WLAN and that only since some days. Before it worked fast everywhere. What else could I try to locate and fix that problem?