billsey said:

I believe you model is one of the SF114-34 series, there have been hundreds of different SF114-34 models and lots of different Swift 1 series... In your case I think that all those had the Intel AX201 wireless card installed, so that helps simplify things. Most driver updates are handled through Windows Update, but it usually puts the drivers in the option updates category instead of installing them by default. Intel though has done a lot more updates than WU has shown, so there is likely one that's newer than what is installed now. I install my Intel WiFi and Bluetooth drivers directly from Intel's support site using the Intel Driver & Support Assistant.

Now, let's try and pin your issue down a bit. If you are having the problem and you move the laptop until it is right next tot he router does it then work? If so one or both of the antenna cables may have come loose. I expect that's not the case since the shop should have seen that if they opened things up. It's possible something is messing with your WiFi network settings. Malware can do that, pointing you at an external server that monitors your full activity, instead of the normal gateway and that will show up with your symptoms if their server is down. You can also see it if your router is acting up, do you have other devices on it that are working well?

We can do a much better job of diagnosing if we have details concerning your network. Right click on the world icon and choose Network & Internet, then click on Properties for your network (it should show you connected to wireless, but without internet) and capture a screen shot to show us. If it shows you not connected to the wireless click on WiFi and on Show Available Networks and capture that for us.