Assuming the ASAs are allowed to communicate to the SolarWinds server (EX: snmp-server host inside 10.1.1.1 community YourSNMP_RO_String) the next most likely culprit would be the Barracuda if you are polling through it. If not, any recent updates to the ASAs? Potentially the interfaces table on the devices was re-indexed- try to remove / re-add the devices.
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