The nanosecond field of the frame header was set to 100 instead of zero in the V1Online.ffl stream at GPS=1241800712 and 1241800751. This seems to be due to one the DAQ process (FsbAlp), being on an unusual state at that time.
The /data/prod/hrec/V1Online/V-V1Online-1241800000-2000.gwf file has been fixed today at 12:28 LT with frames having all nsec fields set to zero.