I would say main port flapping issue has been resolved in EXOS15.3.3.5-patch1-3. However, we are seeing error message during bootup, "Error while loading "halPortDebounce": No interface found!" seen on switches without 10G ports. No functional impact due to this error message.
To resolve this error messages, we have reopened the original PD PD4-4210959789 and it would get resolve in later patches.
The EXOS 15.3.3 patch 1-6 will going to release soon.
The EXOS 15.4, we are waiting for the confirmation from our team.