Trim cord issue

Using the trimmer for the first time cutting grass along a brick path, the cord shortened and disappeared into the spool after about 15 feet. I had to stop, remove the battery pack, remove the top of the spool and and re-thread the trim cord through the feed hole and start again. Another 15 feet or so the same thing happened. Virtually brand new, this tool is essentially worthless and it makes me wary about any other tools from this brand.

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