I had that issue with one set of 4 (how they are wired to work with 12 volts) and I just pressed on the single LED that had a bad connection (red did not work - all other colors did) to the printed circuit board that runs the length of the tape. After pressing it till it lights; it stayed lit until we packed up and moved to a new campground. Last 4 times I used it it worked just great.
The strip can be repaired if you are handy with a small soldering iron and have a replacement strip of 4 that works (off the end maybe).
If it came from the factory that way, I would have them replace the entire tape.
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW