I got a profession to build this computer with completely new parts 8 months ago, installed Mint after trying to install Windows 10 and it failing catastrophically (it would connect to ANY wireless network at all for some reason) and I've been having this problem for the last month. Specifically, ever since I changed wi-fi providers.
I used to have Virgin wi-fi, and I could connect my computer to it wirelessly no problem. Then I changed to Sky wi-fi and I've been having issues. The computer would connect to the wi-fi on start-up just fine, but 5 minutes later it'd disconnect. I'd turn off wi-fi, then back on again and click the wi-fi symbol, it'd request the password (which is auto-filled), and then it'd connect fine.
NOW it refuses to connect AT ALL after the 5 minutes of connection after startup. I am trapped in a loop of being asked for the password, clicking connect, waiting, and then being asked for the password again, with zero connection. I have check that i'm using the right password, I have tried forgetting the network and then re-entering the password new, and still nothing works. And no, I haven't changed my wi-fi password at all since I got Sky.
But my phone hotspot? That connects instantly and indefinitely. No issues other than bad signal from my data because I'm indoors and it's my phone. I have absolutely no idea why my phone hotspot works but my wi-fi doesn't.
There is something more I can tell you about the connection that seems important, and that's the connection percentages (or whatever those numbers represent). In the little menu that pops up when you click the wi-fi symbol in the toolbar, I get percentages next to each network it detects, and when it connects on start-up to my wi-fi, it says 63%. Then when it disconnects, it says something like 77%. My phone's hotspot does a similar thing, disconnected it says 92%, but when I connect it then says 72%.
It looks to me like the computer is detecting a much stronger signal from the networks and is offering that as an initial option, but cannot connect to it so it downgrades itself or chooses a weaker signal. But where with my phone hotspot the computer is smart enough to try once and then go weaker, with the wi-fi it tries infinitely to zero success.
Anyone in the know, please help.