@Shozer I am facing the same problem on my Archer C80 model. There is no problem if the extender is disconnected. It's been three or four months and still no solution. I have helped the developers...

@Spagget I think you are using an extender. Do you have an extender connected to the router?

@Kevin_Z When new firmware Will come and the problems will be fixed. It's been four months and still facing problems.

@Joseph-TP It has been 11 days and I have not received any reply from them. Please look into the matter 😔.

@NickolaZ I am having the same problem as you on my TP-Link C80 router. When the problem occurs, Gives up the internet, the router settings cannot be accessed. Should I also downgrade my router...

@Tristen89 Has your problem been solved? Or are you still facing the problem?