This is interesting. When looking at the Logs, no SuiteCRM log message, but there is an Apache error.
[Wed Nov 11 11:45:03.413833 2015] [core:notice] [pid 2361] AH00051: child pid 2369 exit signal Aborted (6), possible coredump in /etc/apache2
apache2: libmemcached/storage.cc:341: memcached_return_t memcached_send_ascii(memcached_st*, memcached_server_write_instance_st, const char*, size_t, const char*, size_t, time_t, uint32_t, uint64_t, bool, bool, memcached_storage_action_t): Assertion memcached_failed(rc)' failed. apache2: libmemcached/storage.cc:341: memcached_return_t memcached_send_ascii(memcached_st*, memcached_server_write_instance_st, const char*, size_t, const char*, size_t, time_t, uint32_t, uint64_t, bool, bool, memcached_storage_action_t): Assertion
memcached_failed(rc)’ failed.
apache2: libmemcached/storage.cc:341: memcached_return_t memcached_send_ascii(memcached_st*, memcached_server_write_instance_st, const char*, size_t, const char*, size_t, time_t, uint32_t, uint64_t, bool, bool, memcached_storage_action_t): Assertion memcached_failed(rc)' failed. apache2: libmemcached/storage.cc:341: memcached_return_t memcached_send_ascii(memcached_st*, memcached_server_write_instance_st, const char*, size_t, const char*, size_t, time_t, uint32_t, uint64_t, bool, bool, memcached_storage_action_t): Assertion
memcached_failed(rc)’ failed.
So it appears to be a problem with Memcached which I installed for OwnCloud. Any ideas on how to fix this without removing memcached?