First of all, I would like to make sure that the latest update for Archicad is installed. Which Archicad version and build number are you using? This information can be seen via Help > About ARCHICAD. Please navigate in ARCHICAD to Help > Check for Updates... and download and install all the available Updates and Library Updates. We can hope that these updates fix your issue.
If you are still facing with the issue afterward, I'm wondering if you could send me a copy of your project file for further investigation? Please let me know if you need a secure place to upload the file as well.