I'm losing the connection to my printer after 30. sek. so if i start printing a model it will stop and reset after 30 sek. what can be wrong?
See in the log. Firmware tells you the restart reason e.g. brown out or reset triggered.
Does this happen when you start printing or even if just connected? If it happens with printing it might be your power usage or something creates a short when enabled (heater for example) so board resets.