I'm also facing this issue, it started after I re-flashed my Pro1 to LOS 18.1. Sometimes the charging works just fine for about 1-2 weeks, but sometimes it happens daily basis. I don't have a clue what triggers this bug and I haven't found any other solution than reboot the phone. After the reboot the phone begins to charge immediately.
At the moment I've LOS18.1, with the most recent update installed.