All my android devices (samsung smartphones and tablets) started to have massive battery drain (3% a hour) after I purchased Archer VR2100. I pinpointed the issue to the Smat Connect Wifi feature - if it is DISABLED there is heavy battery drain on all samsung devices. After enabling things are OK. This is so weird. By default it is enabled, but I wanted to have it disabled, but now I have to keep it enabled.

It took my quite a while to pinpoint the sudden battery drain to th AP, and then to find out which feature caused the battery drain. I suspected some botched AndroidOS update, but when all devices started to have suddent battery drain I got very suspicious.