Reboot when connecting to board

Hi.
Can i disable the reboot when i try to connect to the APM board?
I give power to the apm and it starts to work.
But when i connect to it over serial using mavproxy.py it immediately reboots.
If something happens and i had to reconnect to the apm over serial in midair then a disaster would happen when i try to reconnect.
How can i achieve rebootless connection to the board?
Thanks...

Start with mavproxy.py and trace the serial connection path that is triggered when connecting to the APM board. Reproduce the reboot over serial if possible, then determine whether the connection process can avoid it; done means reconnecting without resetting the board, including during an active session.

Written by the indexing model from the issue text.