jreginato wrote how can I get a log? The problem is not with my router. It works fine with RE200/210 so I suppose it is related to RE450 itself. On the interface of the extender

Suggest to change the channel of your router can refer to this FAQ: http://www.tp-link.com/en/faq-1314.html

As far as I know , the channel of the extender follows your router, so suggest you change the channel on the router. The channel on the extender cannot changed

press the reset button for 10 seconds first, then refer to this FAQ to reconfigure : http://www.tp-link.com/us/faq-702.html

sounds odd....share this FAQ with you: http://www.tp-link.com.au/faq-702.html Hope you can configure successfully. Suggest you call tp-link support if still have any issue

nothing to do with the Krack attack. Unstable connection on the router. Suggest to check the firmware and hardware, update to the latest firmware. Test when only one device connect to the router...