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If a phone gets itself into a bad state and starts rebooting for no good reason, is there a way to export the contacts info so that after the phone is restored, the contacts can be reinstated? I don't think they were stored to the SIM.
Do you use Google Play Store on your phone? If yes you are logged in with Google and contacts should be synced to Google Contacts. Check it out: contacts.google.com SIM contacts are nowadays used only by a few people, mainly because each entry only supports one name + one phone number.
On modern devices adb backup does not include contacts, see this question. Therefore only if your device is rooted you may be able to extract the contacts.
It would not be easy to export in standard format (do you mean a vcard/vcf?). You would want to try this answer first to verify whether adb can indeed access your contacts data or not. stackoverflow.com/a/59107487
contacts2.db
to VCF usingsqlite3
commandline tool: android.stackexchange.com/a/215426/218526