Try turning off the router manually. Also, TP-Link routers have a night mode setting that will either turn off the led's completely or maybe dim them.

I had turned off the router manually before I had posted my first post.

I don't see a night mode for this particular router on the configuration page.

I have the same problem and it is quite annoying to check if the Router is working fine each time a client asks, you have to turn some other device on log in to the router and check that's quite annoying!

And it's not just the lights are dim, they were dim some time ago, now they are completely off.

They just turn on when you initialize the Router (all blue indicating turning on, the orange until it connects and then all off) so somehow you could be right some kind of night mode is activated, but it annoys me.

I have the same problem, after the last firmware upgrade they power and wifi lights are dimmed, other lights looks fine when you turn it on and connect internet cable,  I already reset several times and not luck, on the app there is not night mode option and in the local website neither

@konkandesi 

The problem is from the LEDs quality used on this router and in particular blue leds has shorter life than other colour leds. And its a shame that TP-LINk continues to use this poor quality leds on this router. This is not an excuse for telling us that if router works normally , no matter that leds works or not...