>I have been working with ublox-Antaris Evalkit (borrowed from a friend).
>This GPS receiver spits NMEA sentences, UBX (ublox binary messages)
>and gives PPS. Very good...so configured NTP with NMEA driver. At times
>it is observed that a shift of -1 second appears and continues for a day 
>or more
>before it comes back to proper time.

Sounds like a firmware bug.

I've seen similar off by a second from NMEA units, but mine only last
a few seconds.  My units have a marginal view of the sky.  They
occasionally fade out.  I've only seen the quirks when they are
recovering from a fade out.

If you get another one, you might let it run for a while (hour?)
and then power cycle the unit so it has to get synchronized again
and see if that fixes things.

-- 
These are my opinions, not necessarily my employer's.  I hate spam.

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