u/Key-Sun-9485

I have a Shelly 1 mini gen 3 and I've been trying to install it into a 4 way light circuit with 5 switch locations. I've identified which switch is the last before the light and installed the Shelly relay there. After 3 days of trying, all I get is sometimes it works and sometimes other switches turn off the relay. I thought I understood the wiring and tried again but no. I have black wires and red wires. I'm probably leaving out lots of info so I welcome any questions. I'd appreciate any help. Fyi the 2 gang box is where I installed the relay.