I find an interesting part in panels log file, it belongs to the affected domains:
127.0.0.1 [2011-12-19 02:36:05] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'pma')
127.0.0.1 [2011-12-19 02:36:06] 'Update Domain DNS Zone' ('Domain Name': 'be-webspace.de' => 'be-webspace.de')
127.0.0.1 [2011-12-19 02:36:06] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'pma')
127.0.0.1 [2011-12-19 02:36:06] 'Update Domain DNS Zone' ('Domain Name': 'be-webspace.de' => 'be-webspace.de')
127.0.0.1 [2011-12-19 02:36:06] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'test')
127.0.0.1 [2011-12-19 02:36:06] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'service')
127.0.0.1 [2011-12-19 02:36:07] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'service')
127.0.0.1 [2011-12-19 02:36:07] 'Update Domain DNS Zone' ('Domain Name': 'be-webspace.de' => 'be-webspace.de')
127.0.0.1 [2011-12-19 02:36:07] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'test')
127.0.0.1 [2011-12-19 02:36:08] 'Update Domain DNS Zone' ('Domain Name': 'be-webspace.de' => 'be-webspace.de')
127.0.0.1 [2011-12-19 02:37:23] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'pma')
127.0.0.1 [2011-12-19 02:37:25] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'pma')
127.0.0.1 [2011-12-19 02:37:25] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'service')
127.0.0.1 [2011-12-19 02:37:26] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'service')
127.0.0.1 [2011-12-19 02:37:27] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'test')
127.0.0.1 [2011-12-19 02:37:28] 'Update subdomain DNS zone status' ('Domain Name': '' => 'be-webspace.de', 'Subdomain Name': '' => 'test')
127.0.0.1 [2011-12-19 03:40:10] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files2')
127.0.0.1 [2011-12-19 03:40:11] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal2')
127.0.0.1 [2011-12-19 03:40:11] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files')
127.0.0.1 [2011-12-19 03:40:11] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal')
127.0.0.1 [2011-12-19 03:40:11] 'Update Domain DNS Zone' ('Domain Name': 'mysaarbq.de' => 'mysaarbq.de')
127.0.0.1 [2011-12-19 03:40:12] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal2')
127.0.0.1 [2011-12-19 03:40:12] 'Update Domain DNS Zone' ('Domain Name': 'mysaarbq.de' => 'mysaarbq.de')
127.0.0.1 [2011-12-19 03:40:12] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files2')
127.0.0.1 [2011-12-19 03:40:13] 'Update Domain DNS Zone' ('Domain Name': 'mysaarbq.de' => 'mysaarbq.de')
127.0.0.1 [2011-12-19 03:40:13] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files')
127.0.0.1 [2011-12-19 03:40:14] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal')
127.0.0.1 [2011-12-19 03:40:14] 'Update Domain DNS Zone' ('Domain Name': 'mysaarbq.de' => 'mysaarbq.de')
127.0.0.1 [2011-12-19 03:40:15] 'Update Domain DNS Zone' ('Domain Name': 'mysaarbq.de' => 'mysaarbq.de')
127.0.0.1 [2011-12-19 04:15:12] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files2')
127.0.0.1 [2011-12-19 04:15:18] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files2')
127.0.0.1 [2011-12-19 04:15:19] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal2')
127.0.0.1 [2011-12-19 04:15:21] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files')
127.0.0.1 [2011-12-19 04:15:21] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal2')
127.0.0.1 [2011-12-19 04:15:23] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'files')
127.0.0.1 [2011-12-19 04:15:23] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal')
127.0.0.1 [2011-12-19 04:15:25] 'Update subdomain DNS zone status' ('Domain Name': '' => 'mysaarbq.de', 'Subdomain Name': '' => 'portal')