Message Authentication Code did not verify. Data integrity has been compromised

Dec  7 23:33:51 WD auth.info sshd[22547]: Received disconnect from 192.168.16.100: 5: Message Authentication Code did not verify (packet #12). Data integrity has been compromised. Jan 7 22:25:31 WD auth.info sshd[19229]: Received disconnect from 192.168.16.100: 5: Message Authentication Code did not verify (packet #2792). Data integrity has been compromised.

^Any clues what those lines really means in wd my book world edition (whitelight) syslog?

p.s. 192.168.16.100 = PC in my LAN

As you can see from syslog this is second time it happened… (my book world edition became totally unresponsible)

Let me expline,

I just opened ssh session to mybook and gone to sleep, leaving PC and NAS on (NAS is on 24/7)… current uptime was 29days.

When I woke up, NAS was not responding anymore… only ping worked, but also not all the time. sometimes, it not responded even to ping.

Since webinterface not worked also, only solution was to brutally plug out power cord … after plugging back, drive was OK again.    I really don’t like doing so, it might damage data in some point…

Any ideas?

Was it connected to a powerstrip? or a wall outlet? Its hard to tell what happened if it wasnt monitored