This morning I checked the cluster for errors, but there were
none. No errors, no change in slave/master
roles or whatsoever. : )
Furthermore the 433 MHz ASK modules still work like a charm! The light sockets seem to respond better to the Raspberry cluster, then to the original remote.
Other little update>> The TV, digital TV tuner, radio etc. are switched off at night, and are powered back on in the morning. This will save some extra €15,- on standby-power a year.