Hi @louisowen2608, welcome to the Samsung Community! Having your primary device behave unpredictably right after a fresh firmware installation is incredibly exhausting, and we want to help restore your peace of mind.
Since you have already tried a network reset, cleared the cache partition, and reseated the SIM card, here are a few advanced steps to help stabilize your connection:
Reset APN Settings: Sometimes updates misconfigure your Access Point Names. Go to Settings > Connections > Mobile networks > Access Point Names, tap the three dots in the top right, and select Reset to default.
Switch Network Modes: If 5G signal handoffs are failing between towers, try forcing LTE. Go to Settings > Connections > Mobile networks > Network mode and temporarily change it to LTE/3G/2G (auto connect).
Test with eSIM or a Different Slot: If your carrier supports it, converting your physical SIM to an eSIM can eliminate physical card or tray faults.
Run Diagnostics: Open the Samsung Members App and navigate to Support > Phone diagnostics > Mobile network to scan for hardware faults.
Test in Safe Mode: To isolate whether a third-party app is conflicting with the new update, you can boot your device into Safe Mode. Press and hold the Power menu until the Power off icon appears, then touch and hold the Power off icon until the Safe Mode prompt appears. Follow the official Samsung Safe Mode Guide for full step-by-step instructions. If your connection remains stable while in this mode, an external app is causing the conflict and should be uninstalled. Simply restart your phone normally to exit.
Give these steps a try and let us know the results so we can assist you further if needed!
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