OK, as far as posting to a J7 thread, you made it clear that your issue with Android and WiFi involves several devices. So the question about what devices you have was based on an assumption you had different devices or you have multiple J7 phones. Most people don't own multiple phones that are the same model. Same brand maybe, but some model isn't the norm.
Anyway, whether your laptop works fine isn't the issue, the problem is your Android devices and the WiFi connectivity problem.
Do you have problems elsewhere too or is it just your home network?
If it is happening everywhere, do you have any kind of anti-virus/anti-malware app installed on your phones? Try disabling it and seeing if that makes any difference.
If it's only with your home network, on your J7 try disabling/re-adding your WiFi network. If that doesn't help, try disabling IPv6 in your router. Another thing to try is If your router allows it, try setting up a temporary guest network, using a completely different SSID and password than your primary network. If your WiFi connectivity is more stable using the guest network, cross-check the settings of your guest network and your primary network. Or just nuke your primary SSID, and set up a new one, some configuration setting in the current one is probably part of the problem.
