@LukasTL On the next conference call try to connect both devices (PC, notebook) via ethernet cable to the C6 so you can isolate the issue and see if it's related to the C6 Wi-Fi or the C6 itself. Or...

@xNero Judging by your description it may be an IP conflict introduced by the new device (laptop). Unplug/disconnect this device from your network and configure your router (when connected only to...

@LukasTL I just realized the way you try to test your internet speed. I have mimssed that from your firts post. You should not test your internet speed from two different devices at the same time. I...

@LukasTL Make sure your wireles security settings for both bands are: Check for wireless interference arround you, installing "Wi-Fi Analyzer" app on your phone and scan. If there is, change the...

@LukasTL In the Kevin's post (Recommended solution) there are 3 options - choose the right one according to your region:

@LukasTL Try the beta FW from this thread. Disable OneMesh feature and test. You can always revert back to the current FW if this doesn't help.