V4.30 - HA-Pro generates micro-cuts of traffic

Hello, We have 2 HA-Pro Clusters (2 * USG310 + 2 * ZyWALL110) - Firmware version of the 2 clusters: 4.30 If the cluster is running with both devices turned on (1 active device + 1 passive device), we we encounter random micro-cuts of the traffic transiting via the active device. (For example, external users are temporarily disconnected from their Terminal Server session, Outlook temporarily disconnects from the Exchange server, etc.) If I power down the passive device of an HA-Pro cluster, it will not There are more traffic interruptions on the active device. There is never HA-Pro failover, ie the active device remains active and the passive device remains passive. Simply that the passive device is turned on causes micro-cuts of traffic passing through the active device. In other words: During normal operation of the HA-Pro cluster, the communication (Synchronization of the configuration, sessions, VPNs, etc.) between the 2 active and passive devices causes micro-cuts in the traffic of the HA-Pro active device. We had this phenomenon before, but it got worse with the installation of firmware version 4.30. Thanking you in advance for your help, I offer you my best regards.