Importing contacts fails

I am trying to import (344) records based on the external ID. At the last step, the import fails at 87%, giving the following error:

Warning: MySQL server has gone away query: INSERT INTO drupal_watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', '%message in %file on line %line.', 'a:4:

{s:6:\"%error\";s:12:\"user warning\";s:8:\"%message\";s:103:\"MySQL server has gone away\nquery: SELECT role_id FROM drupal_civicrm_group_roles_rules WHERE group_id=2\";s:5:\"%file\";s:135:\"/usr/home/debxxxxx/domains/covs.org/public_html/sites/all/modules/civicrm/drupal/modules/civicrm_group_roles/civicrm_group_roles.module\";s:5:\"%line\";i:166;}

', 3, '', 'https://www.covs.org/civicrm/import/contact', 'https://www.covs.org/civicrm/import/contact?_qf_Preview_display=true&qfKey=64c8cdcc84390b54a36f7d7159444d64', 'xx.xx.xx.xxx', 1265194885) in /usr/home/debxxxxx/domains/covs.org/public_html/includes/database.mysqli.inc on line 128

When using 3.0.2 this import succeeded. Other (larger in size, fewer in rows) files succeed as well. On the demo site, importing succeeds. I have tried ti increment connection time, memory without any luck.