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The system health being bad is abnormal. Generally a process or component didn't come up if that's the case. the "debug" shell command "show sensor health" can give a little more detail.
A cold boot will help determine if this is a hardware component, but I recommend opening a support ticket for further assistance.
In addition, the manager uses SNMP for control channel communiction on port 8500 UDP from the manager to the sensor. Ensure you have connectivity on that port through an other network devices (i.e. firewalls).
A wireshark capture can confirm you are getting replies.
Packet fragmentation on the port 8500 UDP port is another common problem.