switching between 3 internet lines

I have three lines configured on my peplink, one configured in drop in mode, and 2 others

when the first line fails, the failover does not happen, I lose the internet connection altogether

I have three lines configured on my peplink, one configured in drop in mode, and 2 others

can someone help me

You will need to share a diagram showing how you have plugged everything together and then some screenshots of your config for us to help on the forum.