The phrase "loose strings" refers to unfinished or unresolved issues or tasks. It suggests that there are some things left incomplete or hanging, like untied shoelaces, that need to be addressed or dealt with. Full definition
Cats should never have any toy that includes loose string or yarn. (cattime.com)
But rather than inject any genuine humor into the thing, all the «jokes» are culled from McCarthy letting loose a string of expletives or throwing karate chops at unexpected vocal chords. (silverscreenriot.com)
We do not believe in loose strings, and make ourselves readily available to you (via E-mail, Text, Phone, Whatsapp, or Facebook) both before and during your visit in our country to be sure of the quality and ease of your stay. (surferdream.com)