boringproxy: server killed

Hi , boringproxy was running boring and smoothly yesterday with 2 clients , then i tried to add another client the server was killed , first i was thinking maybe there is a number of connections limit , then i deleted one connection and tried again but no luck , server killed, then i started from fresh ; setcap -r boringproxy-xxxxxx deleted boringproxy.json deleted boringproxy-xxxxxx

curl again boringproxy chmod +x setcap settings

aquire certificate and runs nicely , clients can connect without problems , but when i try to add a tunnel , on the terminal prints only “killed”
since there is no logs and no more info prints on the terminal someone know what ca be the problem?? now it`s really boring… to get this works