Check the Minion.log file, maybe you can find an entry of an addon name where it "hangs" (timestamp in the log is there for a long time, then it restarts minion e.g.).
Backup the minion.xml file then and search for this addon in the xml file, remove the addon's complete entry
starting at the
Code:
<addon md5="....">
<dirs>
<dir>Addon name here</dir>
until the closing tag