Hey Cirpian,

The RefreshThread in SLDataGateway is responsible to keep the most recent datapoint for active trended parameters alive in the cassandra database. This is done so that stable parameters which do not write updates to a database often can still display trending and are not removed due to the TTL being expired.

It is a bit tricky to say what a cause for malfunction is without error. But generally it is issue with writing or contancting the cassandra database, which should be logged in SLDBConnection.