Phone’s acting abnormal, smash it with a hammer. Alternatively, try these resets!
I covered two ways to reset a cisco IP Phone (Soft and Hard resets). These are particularly helpful in trying to correct strange behavior by the phones, eg: pulling from multiple vlans, wrong NTP, etc. There is an even “harder” reset which I didn’t cover that uses a different set of key presses. You can brick a phone using that one so I’ll let you Google it yourself! Happy troubleshooting!