systems-link wrote @2Albert Have you tried to seeing if using an address reservation works? If it does then it could be isolated to the router releasing the IP and your device not getting a new one....

@Kevin_Z Kevin_Z wrote @2Albert Thank you very much for the detailed info. Does this Samsung A51 connect to other wireless network automatically when it leaves the network? Please kindly help test...

@Kevin_Z Kevin_Z wrote Hi, does this issue happen every time you leave home and get back? When it shows "Couldn't get IP address" on the Samsung A51, is it still showing connected to the C6 network?...

I connect to router via wifi with Samsung A51 in the evening. Everything is working fine. After leaving home, and coming back, on the next evening phone gives "Couldn't get IP address", and I cant...