Hi xue28,
Thanks for your reply.
Yes, it was 7.1.1 of course, not nine, sorry. Have solved the issue in the meantime and it seems that woocommerce was NOT the culprit ?? I deleted an ._index.php and similar other — appearantly corrupted — files in the /wp-content directory that seen to have caused the 500 Internal Server Error. Not sure what exactly been the initial trigger, but maybe another plugin that I’ve updated.
So thanks again and Happy Holidays ??