This Panasonic KX-T3155 is a corded 2-Line phone with Conf button.
It developed this problem that when a call comes in on Line 1, there is a brief ring, while the caller gets a busy signal, and on the phone, the normally red LED Line indicator goes green (like it's connected to a conference call). The green conf light also shows up on Line 1 when a call comes in on Line 2, which still works ok with ingoing and outgoing calls.
Searched for those symptoms online but couldn't find anything.
I really like this phone, so I was just wondering if anyone has come across that problem, or if it's time to buy a new one. Thanks.