for constant try checking your wifi signal with those analyser app. to determine the strength. mine dont have drop out issue. but the whole 5g band is missing specifically from the Dlink 868L
i figured out already. For those using Dlink 868L router with 5g band missing. Connect to your router page.
Enter configuration of 5ghz to the followings
5GHz Band 802.11 Mode
Channel Width (very important)
Auto 20/40/80 mhz
For the solution related to this problem, simply click the baba support where the router related queries are easily solved in the router section. The technical expert number is also mentioned. I have visited the website and found it useful.