I’m using sonoff switches to control all my lighting at home, it was about few months before this problem occur. All sonoff switches responses very slow (15-30sec) sometime even longer or might not response at all. From the ewelink app the switch may show disconnected to wifi when it takes very long time to react, but however the switch will connect back to wifi again after sometime. Not sure want happen to these switches, other smart lighting like my yeelight which sharing the same wifi is working brilliantly. hope someone could give me some advise..thank you in advance!