If we knew the solution we would post it, but after looking online it's difficult to find any answers.
This is a longshot and I cannot guarantee it will solve your issue.
- Backup local device files
- Settings > Accounts > Google > Disable sync options for Chrome and App Data.
- Reset your Chrome sync - Chrome Help
- Enable device Encryption
- THEN Factory Reset
- Create a new Google account
- Add your old Gmail as secondary in Gmail only