Hello! This problem just manifested a few weeks ago. My router is only a ~10-15 meters away from my computer, (my computer is in my room, the router is on the staircase right outside my room). Basically, I have no trouble when on 2.4 ghz, but when I connect to 5ghz, my wifi will be fine for maybe 45 minutes, then it will disconnect for about 1 minute without warning. When I use the network diagnostic troubleshooter built into windows 10, It solves the problem itself (I know, troubleshooter actually solving the problem) by simply reactivating my network adapter. My adapter is the ASUS PCE-AC51 (AC750). I had not been having any problems, and this problem came out of nowhere recently without any kind of windows update or driver update.