Half flight mode problem

My Samsung Galaxy F23 5G (around 4 years old) has developed a strange "half flight mode" issue. Mobile network keeps disconnecting or doesn't work properly even though the phone isn't in Airplane mode. I've already tried restarting, toggling Airplane mode, and reinserting the SIM, but the problem persists. Has anyone else faced this issue? If so, what was the fix?It also has flight mode in light blue colour and Wi-Fi and mobile data can't be turned on