Its very rare case when I see message :
“MYSQL server has gone away” , a few things to consider are :
* Check variable max_timeout
* Check variable max_allowed_packet
These setting available in my.ini or my.cf file, edit the value and restart mysql daemon.
Example :
max_allowed_packet=16M
max_timeout=28800
Try again to import database using mysql command and see the different

Click here to read more from mysql gone