@Solla-topee Thanks for your reply. I have shared the MAC addresses in DM. The two C500 will go offline short time (1-2 hours) after being online. So i need to power recycle them to bring them back...

Hi @Solla-topee I recently purchased two C500 and one C210 and one C310. Same issue with the C500s. Both are hw ver 2 and on firmware 1.1.2 Build 250326 Rel.61993n. No issues with the other two...