@TP-Link_Deco In the network we have 2 decos on two separate floors the one above the other. According to my ISP logs the internet wasn't down during the period that we are experiencing this problem....

@Kevin_Z I have a set up of E4R decos. Since I couldn't find any other discussion related on this issue, I decided to post here my question. A week ago, TP Link announced new firmware for my devices....