even that this is still an unsupported environment you may want to look into getting :
system is restarting after receiving SIP OPTIONS message that should be ignored by the system
Please work with Polycom support on accessing the above Hotfix and see if this fixes the reboots.
Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels. Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's