my iPhone 14 loses internet and fails calls

I bought my iphone 14 overseas. Now, it sometimes loses internet whether connected to wifi or 5G/LTE. I will have to restart the phone to restore internet. Other times, when I call a contact, it rings and when answered, call fails. After I restart my phone, that’s the time the call goes through. Both instances have good signal, 2 bars or higher. Does anybody experience the same?