I've had subversion up and running with apache2 on an Ubuntu server for about a year now. I've used it almost every day without any problems until 4 days ago. I can browse my repositories through a web browser and I can also list my repositories using

svn list http://xx.xxx.xxx.xxx/svn/repository

But when I try to update or commit something the server hangs and I have to wait for about one minute until I can reach it again. I've searched everywhere but can't seem to find any solution. The apache error.log says

[Sun Mar 17 16:36:36 2013] [notice] caught SIGTERM, shutting down
PHP Warning:  Module 'ssh2' already loaded in Unknown on line 0
[Sun Mar 17 16:36:37 2013] [notice] Apache/2.2.22 (Ubuntu) DAV/2 SVN/1.6.17 PHP/5.3.10-1ubuntu3.6 with Suhosin-Patch configured -- resuming normal operations

and the other_vhosts_access.log says

- [17/Mar/2013:16:37:44 +0100] "OPTIONS /svn/repository HTTP/1.1" 401 677 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
- [17/Mar/2013:16:37:44 +0100] "OPTIONS /svn/repository HTTP/1.1" 401 677 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "OPTIONS /svn/repository HTTP/1.1" 200 876 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "OPTIONS /svn/repository HTTP/1.1" 200 876 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "PROPFIND /svn/repository HTTP/1.1" 207 554 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "PROPFIND /svn/repository HTTP/1.1" 207 554 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "PROPFIND /svn/repository HTTP/1.1" 207 554 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "PROPFIND /svn/repository HTTP/1.1" 207 554 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17/Mar/2013:16:37:44 +0100] "PROPFIND /svn/repository/!svn/vcc/default HTTP/1.1" 207 453 "-" "SVN/1.6.18 (r1303927) neon/0.29.0"
user [17
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