Well. First. Thanks for a collection of new panic types to add to my [[iPhone Kernel Panics|iPhone Kernel Panics|new_window=true]] page. It's still a bit of a work in progress, but sort of a passion project.
Secondly. The SEP panic. Sounds like bad news. The SEP is the Secure Enclave Processor. Which is basically a part of the CPU Which handles and houses all the secure data on the phone. Things like Face ID or Touch ID are most notably stored here. But that's not all. It's super important for proper iPhone boot and normal function.
I will have to do a bit more research since the other two panics are not ones I recognize. But honestly. This sounds like it is very likely an issue with your board.
In which case, if there is a warranty trying to get in touch with the vendor might be a better bet. But have a look at the [[iPhone Keeps Restarting|iPhone Keeps Restarting page|new_window=true]] just to make sure you've covered your bases if you want to repair this yourself.