Docker container lose connection in network_mode: service:tailscale

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Hi team!
So i have some strange behavior, i’m losing my connection on my Firefox container after 1 minutes.
It works at the beginning then stop working, my tailscale container still get internet connection
IMPORTANT:

  • this only happen when i use my phone(shared connection) with my pc
  • On wifi everything work same container & docker-compose.yml and i get ipv4, ipv6 & internet connection
services:
  tailscale:
    image: tailscale/tailscale:latest
    container_name: tailscale
    hostname: tailscale
    environment:
      - TS_AUTHKEY=my long key 
      - TS_EXTRA_ARGS=--advertise-tags=tag:container --login-server=http://ip-server:Port
      - TS_STATE_DIR=/var/lib/tailscale
      - TS_USERSPACE=false
    volumes:
      - tailscale:/var/lib/tailscale
      - /dev/net/tun:/dev/net/tun
    cap_add:
      - net_admin
      - sys_module
    restart: unless-stopped
    
  firefox: #based on alpine image
    container_name: firefox
    build: ~/path/images/firefox/
    depends_on:
      - tailscale
    network_mode: service:tailscale
    restart: unless-stopped
    stdin_open: true
    tty: true
    command: sh

maybe some package are missing, what are the important one to install on alpine ?
if someone have a clue
Thx !