I had a similar issue a while back and a person on here helped me with that exact settings change, so it's kind of paying it forward. Coincidentally, it was with my Dell Inspiron 15 3000 series laptop that it helped. I have the 3521 model from about five or six years ago, but it's very similar to yours, as is the WiFi network adapter it uses. And though I most often use the desktop I'm not now, I do use the laptop occasionally, which still works perfectly.
AMD FX-6100 | Samsung 250GB 840 EVO SSD | Western Digital Blue 500GB HDD | 16GB DDR3-1866 | EVGA Geforce GTX 550ti | Windows 10 Pro 64-bit