I just had a similar problem with upgrading to public release 14.0.1. My issue started when after updating iOS my Face ID stopped working. I have the iPhone XS 256GB and had no issues with the phone prior to the update. After trying to reset the Face ID settings with no luck I decided to power down the phone. After it turned off I turned it on and the boot loop issue started. Took it to VZW store and they could not help. Came home and connected it to my laptop. Once connected to my laptop it booted up successfully. At that point I backed up to iCloud and the performed a full erase and restore from iCloud. Have not experienced the boot loop since but still cannot get Face ID working. Patiently waiting for apple to release a fix.
Fshowtr
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Lake Forest, CA, United States