One UI's Wi-Fi stack caches network profiles more aggressively than stock Android, which is great until a profile gets corrupted. 'Obtaining IP address' loops and networks that vanish from the list are almost always fixed by forgetting and rejoining, not by router changes.
- 1Toggle Wi-Fi off and on from Quick Settings, then wait 20-30 seconds before trying to connect, One UI's radio takes a moment to re-scan after a toggle.
- 2Forget the network: Settings → Connections → Wi-Fi → tap the gear next to the network → Forget, then rejoin with the password fresh.
- 3Check Settings → Connections → Wi-Fi → More (⋮) → Advanced → and confirm 'Switch to mobile data' isn't set to auto-switch away from a weak Wi-Fi signal mid-connection.
- 4Reset network settings: Settings → General management → Reset → Reset network settings, this clears saved Wi-Fi, Bluetooth and mobile APNs on Galaxy phones without touching your data.
- 5Update the Wi-Fi/network firmware indirectly by installing any pending Software Update (Settings → Software update), Samsung ships radio firmware fixes through regular OTA updates.
- 6If only 5GHz networks fail while 2.4GHz works, check your router's channel width, some Galaxy models have had DFS-channel compatibility issues on certain router firmware.
- 7As a last resort, boot into Safe Mode to rule out a VPN or security app hijacking the connection.
Tip: Run our Internet Speed Test right after reconnecting to confirm you actually have a working connection and not just a green Wi-Fi icon with no real throughput, a known One UI display bug shows connected before the IP lease finishes.