Tested with cloud, without cloud, changing firewall parameters, disabling ALG na UPnP - nothing helps. It definetly must be bug in software and some overflow.

Another question: are you logged in to tplink cloud?

@Kevin_Z 1) All led's go down and up again like in restart from administration area. 2) Network layout here is simple - router connected to ISP modem that provide WAN area directly from fiber to...

@swuggmaister So the USB is not source of the problem. This need to be investigated by tplink - of course I can send back on warrenty, but this is not looking like hardware problem. For many people...

@dmk So we have quite similar environment. What about USB, are you using any disk plugged-in to router? I have one for TimeMachine purposes (but it's there for last one year, and everything WAS...

@swuggmaister Probably this will be path in english/swedish software version: System Tools -> System parameters -> NAT (and there should be two cehckboxes - NAT and NAT Boost)