I am also experiencing the same issues. I have to sometimes reboot my phone 3-4 times daily. I have been an iPhone user for over 10 years now and I am not impressed with the iPhone 14 Pro Max. It seems like it has a lot more problems than my last iPhone XS Max. My son is using my old iPhone XS Max and he doesn't have any problems with it.
My biggest complaint is when a call is coming in I can't answer it. Also when trying to use DUO to authenticate it won't let me click on the "OK" button until I restart my phone. I hate to say it, this has got to be the worst phone I have ever owned that was produced by Apple. The androids not only have better cameras that can optical zoom 50x before having to do a digital zoom. I have what 3x optical zoom with my iPhone 14 Pro Max. I will tell you, taking a picture of the moon with my phone I only see a small dot where with my neighbor's phone they can fill the entire frame. However, the night time pictures with the low light feature on my phone is far superior than I have seen on any other phone.