What is the fine-grained topic of the following text: There are two common causes for this, that I have experienced: 1) the GTM25 charging unit had a badly assembled batch, that caused the outer braid of the charging cable (power return/ground) to touch the red +5V power conductor, that was stripped too far back to expose the copper wire, making it intermittently short. Only return the topic.
Common causes for problems with the GTM25 charging unit