A lot comes to my mind regarding this. But for Android, most issues regarding WIFi can be fixed by resetting the network settings. Just go to Settings > Backup & Reset > Network Settings Reset .
Another reason is perhaps it is an issue with the routers itself. It would be best to check if other devices can connect to these WiFi network without any issues. With that we can determine if this is specific to your device, or it is related to the router
Your solutions experts are here DSN. Let’s work together to see what’s going on. Which make/model do you have? How long has this been happening? Have you downloaded any new applications to the device recently?
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