Wake on LAN stops working after rooter reset

[k7fromi]

Hello, I am running teamviewer on Android to control my PC with Windows. I have set up wake on lan and it works fine, I can wake my PC via my public adress. My problem is that after I reset my rooter, wake on lan doesn't work for the first time. If I power on my PC from the power button (just one time after the rooter reset), then wake on lan starts working again and I can wake my PC from Android again.
This is a problem for me because the rooter has to be reset from time to time.
Do you have any idea why this is happening ?