Looks like normal winter dockings/maintenance. Fjordline schedule shows a gap in the service 27/12/2017-2/1/2018. Then there are some dockings:
"* Between January 2nd 2018 and February 15th 2018, MS Bergensfjord will be in dock due to scheduled maintenance. Therefore, there will be no departures on the route Bergen/Stavanger- Hirtshals on Tuesdays, Thursdays, Saturdays and Sundays during the maintenance period. Accordingly, there will be no departures on the route Hirtshals-Stavanger-Bergen on Mondays, Wednesdays, Fridays and Saturdays during the same time period.
**MS Stavangerfjord will sail from Bergen and Stavanger on Wednesday 14th of February. On the 15th of February there will only be a round trip Hirtshals - Langesund. On the 16th of February MS Stavangerfjord will do a round trip Hirtshals-Langesund before returning to the regular schedule on the west coast of Norway.
***MS Bergensfjord will once again depart from Bergen on Friday February 16th. After this, the routes will be operated as normal."