I can understand how frustrating this issue can be. Have you tried resetting your network settings? Have you tried swapping out your sim card? Have you tried reaching out to your carrier?
I'm having the same issue as you. My phone drops multiple times within an hour. I will see it flash "No Sim" on the top left corner and go no service for 3 -6 seconds. Then service comes back. I will usually also see a message on the bottom saying "Call cannot be transitioned to Wi-FI and continues over cellular network" even though I have Wifi and WIfi-Calling settings OFF! I'm seeing multiple people saying the same thing!