Polycom IP 550 keeps rebooting

[scythe000]

Hi!
Very new to 3CX, but we have a Polycom Soundpoint IP 550 SIP that keeps rebooting. I've reset the config several times. It comes up to a mostly blank screen with it's extension then reboots. The soft switch is working as the PC connected is online.
Any ideas?

 

[new40]

We are having this same issue just after an upgrade to v15.5. We have now tried multiple Soundpoint IP 550's, and on a certain extension the phone will just reboot at random. We have relocated to new CAT6 cabling, new port on the PoE switch with no resolution.
Any assistance would be appreciated.