iPhone 7 microphone, earpiece and camera not working

The microphone and earpiece on my microphone does not work. The camera is very laggy and does not capture videos. The SIRI also does not take voice input ( microphone issues). If I restart the phone however, the phone works fine for a few hours. The calls can be listened clearly and the SIRI also works fine. The camera is also very snappy after a restart. But then after 1-2 hours, the problem continues.

Note: If connected to a bluetooth headset I can utilize the microphone and earphone of the headset for phone calls.