When I bought my Asus S550C a couple of years ago, I had the exact same issue of the WIFI connection dropping.
I was using the laptop for online webinars and interviewing client via video link. The internet connection problem made me look unprofessional.
First, I resorted to the wired connection for the serious online meetings. Then I bought an Asus USB Wireless dongle. The USB dongle worked well and the connection is stable, even showing a better signal quality as compared to the internal WIFI adapter.
Conclusion
The problem is with the internal WIFI adapter. I blame ASUS for that, not Microsoft.