On 26 August 2022, an experienced UAV pilot lost control of a DJI Mavic 3 in central Bergen and it flew at high speed towards a building and crashed through a third-floor window slightly injuring a person inside. Why control was lost could not be established but it appeared to be associated with a fault in the transition between two flight modes. The absence of adequate and timely technical assistance from the UAV manufacturer - which had a European import approval for it - limited the ability to establish the cause of the event prompting three related safety recommendations.