Was this issue solved with the latest ArubaOS-Switch KB.16.01.0007 version (31/05/2016)?
Among the fixed issues listed in the relevant Release Notes (here) I see that the CR_0000190804 looks quite similar (even if no relationships with ISC, Fiber Optics ports and VLANs were expressly cited):
Distributed Trunking CR_0000190804
Symptom: Network connectivity or traffic loss is observed in a Distributed Trunking (DT) configuration.
Scenario: When a Distributed Trunking switch member is rejoining the distributed topology following a reboot, the topology might experience traffic loss and connectivity issues to downstream the trunks.
Workaround: Before reboot, disable the switch interfaces configured as dt-lacp/dt-trunks using the CLI command interface <PORT-LIST> disable and re-enable them after the switch reboot with the CLI command interface <PORT-LIST> enable.
Example:
(config)#: interface <PORT-LIST> disable
(config)#: write memory
(config)#: boot system
(config)#: interface <PORT-LIST> enable