[PVE-User] HEALTH_WARN clock skew detected on mon.1

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Hi,

Occasionally (three times a month or so) we are getting "clock skew 
detected" errors on our 3-host proxmox 4.3-1/e7cdc165 cluster.

ntpd is running on all three hosts, all configured to use the same 
internal ntp server to sync with. Ntpdc reporting like this:

> root at pm1:~# ntpdc -p
>      remote           local      st poll reach  delay   offset    disp
> =======================================================================
> *dns.internal.server 192.x.y.5    3 1024  375 0.00015  0.010197 0.12566
> root at pm1:~#

and

> root at pm2:~# ntpdc -p
>      remote           local      st poll reach  delay   offset    disp
> =======================================================================
> *dns.internal.server 192.x.y.6    3 1024  377 0.00014  0.004051 0.00836
> root at pm2:~#

and

> root at pm3:~# ntpdc -p
>      remote           local      st poll reach  delay   offset    disp
> =======================================================================
> *dns.internal.server 192.x.y.7    3 1024  377 0.00009 -0.000008 0.01028
> root at pm3:~#

It it seems to me that everything IS in sync??

Why would this happen? Sometimes it auto-disappears after 15 minutes, 
but the longest has been three hours.

Tips, trics? All my reading/google voodo suggests me to install NTP, but 
we are already.

Best regards,
MJ