Check the same and make sure it is not the reason to this problem The problem might be there just because your phone is having an OS or a hardware problem.Make sure the router is not having any configuration error related to the same which is causing this problem.This problem is often experienced when you are already downloading a lot of data on your device.Check if the network password you entered in your Samsung Galaxy A21 is incorrect/outdated.The reason to this problem is nothing but a basic glitch associated with the default Wi-Fi drivers.The router might not be able to allow more connections just because its limit is reached.Sometimes the users have to face this problem just because the app/browser or domain they open is having something wrong with the same.Your internet connection probably has a bandwidth limit on the same and it might have reached.The device might not be getting proper Wi-Fi signal strength because of placing the router at an odd location in your arena.There is a probability of having a problem either with the signal antenna on the phone or on the router you are using.Make sure this problem is not there just because the network security is turned OFF. Don’t make any changes to the Local Area Network settings on your device.Check if this is the reason to the problem The network you are trying to connect your device to might be having a lot of congestion due to a number of devices connected to the same.Make sure the problem is not there just because the phone is having a hardware problem.A simple restart can fix this problem.The phone Bluetooth antenna might be unable to perform its task just because of a fault or if the devices are not placed within the defined Bluetooth area i.e.There are chances that any of the devices you are going to connect to each other is infected with a virus or there is a similar security issue.
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