@pjs_gsy I have the same problem too with the 2.4 GHz band, it will show "no internet connection" and all the "smart switches" will be off-line. Is there a newer firmware that we can install to solve...

I have similar problem, when I use the XE75 the smart switches will suddenly "off line" and it is hard to get back them online again. Later I discover that I can resolve the problem by diable the 6...