Tune-up and new chain, and chain broke after about 12 rides

Jan 13, 2021
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I'm new to cycling and wanted to check in on something. I took my bike to the local bike shop at the end of February. Replaced the chain while they were at it. About two months later, I was at a 100 mile ride and about 20 miles in, the new chain breaks. Probably about 12 rides on the new chain. Brought it back in today and was told the rear hub seemed loose. Any ideas? Could this be related to me using a new bike rake to transport it?

Thanks for any thoughts.
 

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