In testing out the Core NFC API~ iPhone 7, IOS 13.1,13.2With the Sample-NFC-Application available at~ https://developer.apple.com/documentation/corenfc/building_an_nfc_tag-reader_appI've occasionally gotten an Error, as reported by the Delegate-Callback for when the Reader-Session has invalidated~ readerSession(_ session: NFCTagReaderSession, didInvalidateWithError error: Error)of NFCError Code=203 “Session is invalidated due to system resource is unavailable”Once this error has triggered, it will continue to occur anytime another NFC-Scan is attempted.The error will then also occur for any other App that tries to use the NFC API~ e.g. NXP-TagInfo https://apps.apple.com/ca/app/nfc-taginfo-by-nxp/id1246143596Effectively killing NFC App functionality on the IOS-Device..The only way to stop this is to Restart the IOS Device.Here is a Stack-Overflow Post on the issuehttps://stackoverflow.com/questions/48172963/how-to-avoid-nfcerror-code-203-session-is-invalidated-due-to-system-resource-isI'm assuming from the Post, and my own testing that attempting to start another NFC-Scan when one is already in progressis one of the main factors in causing the error to occur.My questions are;1. Are there any other actions that would cause the NFCError 203 to occur?2. Is there any way to fix the state of the NFC functionality of the IOS-Device once the NFCError 203 error has occurred, other than restarting the IOS-Device?