Something curious happen with an Exported/Imported flow – General

CONTEXT: Running some test flows between two PC’s.

PC1: MQTT Broker with several clients; Client 1 sends messages to Client 2. Clients 1 & 2 very simple five node groups

Exported Client 1 as JSON file and Imported it to PC2.
While the connection of Client 1 on PC1 remained stable, the connection of Client 1 on PC2 kept connecting and disconnecting.

Confirmed that the WiFi connection on PC2 was strong.
Disabled Client 1 on PC2, and rebuilt it exactly from scratch on PC2, the connection now remained stable.

Any suggestions as to why the imported Client 1 on PC2 failed to maintain a stable connection, and the rebuilt Client 1 was stable?