The red LED is lit and the blue LED flashes very quickly in succession. When I try to connect to the Nixie network via my mobile phone, the blue LED goes out for a while, the connection failed and the blue LED flashes quickly again.
I disconnected the wifi module. The clocks went well until now, a moment ago to display time, date, etc. They lit up on each display number 4. So the clock shows the time, shows the date, passes the anode sequence and the number 4. It still helps everywhere.
The clock went for about a week without problems (except the WiFi module). They are placed on a wooden pad with columns and are covered with plexiglass to avoid them. Thus, there was no manipulation, nor a possible short circuit, etc. All 44 44 44 appeared out of nowhere.