The issue may happen when GS1900-8 connected with a NAS system.
Shortly after the user enables LACP in conjunction with a NAS device, the GS-1900 reboots.
This issue happens on GS1900-8 only, other GS1900 don't show this issue.
Attached file is the date code for GS1900-8. If you face the similar symptom, please upgrade this date code.
Regarding the next patch release, the schedule will be at end of May 2018.
If further support is needed, best would be to contact the support staff.