Hi sayan1996,
Thanks for posting in Apple Support Communities! Since you're having an issue with your Wi-Fi connection, we suggest forgetting the network and reconnecting again in Settings > Wi-Fi. This can refresh the connection. If it continues, we recommend resetting the network settings completely:
If you're using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. If you're using iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
These steps may resolve the issue you're experiencing with your connection, and can be found in the article If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network.
Should it continue, let us know if it happens on another Wi-Fi network, so that we can isolate what may be the cause of this behavior.
Cheers!