NV+ 4.1.9 constantly re-syncing

Aug 19 15:13:19 nas-01-3B-D2 /usr/sbin/cron[886]: (CRON) INFO (pidfile fd = 3)
Aug 19 15:13:19 nas-01-3B-D2 /usr/sbin/cron[890]: (CRON) STARTUP (fork ok)
Aug 19 15:13:19 nas-01-3B-D2 /usr/sbin/cron[890]: (CRON) INFO (Skipping @reboot jobs -- not system startup)



***** File system check performed at Sun Aug 19 14:59:42 WEST 2012 *****
fsck 1.40.11 (17-June-2008)
e2fsck 1.40.11 (17-June-2008)
c was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
c: 24/30474240 files (4.2% non-contiguous), 512763/60889088 blocks


Aug 19 13:44:51 nas-01-3B-D2 kernel: VERSION/ID : SB=(V:0.1.0) ID=<a2013bd2.00000000.00000000.00000000> CT:502d2ae5
Aug 19 13:44:51 nas-01-3B-D2 kernel: RAID_INFO : DISKS(TOTAL:2 RAID:2 PARITY:1 ONL:2 WRK:2 FAILED:0 SPARE:0 BASE:0)
Aug 19 13:44:51 nas-01-3B-D2 kernel: SZ:1953108616 UT:00000000 STATE:0 LUNS:2 EXTCMD:1 LSZ:1953108614
Aug 19 13:44:51 nas-01-3B-D2 kernel: LOGICAL_DRIVE : 0: B:0000000032 E:0004096000 R:1 O:1 I:1:000000000 DM:3
Aug 19 13:44:51 nas-01-3B-D2 kernel: LOGICAL_DRIVE : 1: B:0004096032 E:1949012614 R:1 O:1 I:1:000000000 DM:3
Aug 19 13:44:51 nas-01-3B-D2 kernel: PHYSICAL_DRIVE: 0: DISK<N:0/1,hdc(22,0),ID:0,PT:1,SZ:1953108616,ST: B:online>
Aug 19 13:44:51 nas-01-3B-D2 kernel: PHYSICAL_DRIVE: 1: DISK<N:1/2,hde(33,0),ID:1,PT:1,SZ:1953108616,ST:P :online>
Aug 19 13:44:51 nas-01-3B-D2 kernel: CURRENT_DRIVE : DISK<N:0/1,XXX(22,0),ID:0,PT:1,SZ:1953108616,ST: B:online>
Aug 19 13:44:51 nas-01-3B-D2 kernel: Total=2; raid=2; ready=0; work=2; failed=0
Aug 19 13:44:51 nas-01-3B-D2 kernel: sata_hotplug: /sbin/hotplug xraid_sync_finished hdeUser mode helper start.
Aug 19 13:44:51 nas-01-3B-D2 kernel: done do_sata_hotplug
Aug 19 15:13:18 nas-01-3B-D2 syslogd 1.4.1#10: restart.
Aug 19 15:13:18 nas-01-3B-D2 kernel: klogd 1.4.1#10, log source = /proc/kmsg started.
Aug 19 15:13:18 nas-01-3B-D2 kernel: Linux version 2.6.17.14ReadyNAS (root@calzone) (gcc version 3.3.5 (Infrant 3.3.5-1)) #1 Wed Jun 20 20:08:20 PDT 2012
Aug 19 15:13:18 nas-01-3B-D2 kernel: You system is PZERO.
Aug 19 15:13:18 nas-01-3B-D2 kernel: ASIC=IT3107
Aug 19 15:13:18 nas-01-3B-D2 kernel: zlist 0 802f115c
Aug 19 15:13:18 nas-01-3B-D2 kernel: zone 802f0f14, name Normal



So something happened at 15h13 - a reboot -but why? Do these look like spontaneous reboots?

Thanks,