For those that are not aware, the late model Thor Hurricane/Windsport uses sealed LED tail light assemblies. They are supposedly good for 20,000 hours of use before the bulbs start to burn out. The vast majority of folks will never have to deal with their tail lights.
However, way before those 20,000 hours of bulb use, some unfortunate people find that moisture has found it's way inside, (through one of the "not so-hermetically sealed plastic welds", or through the electrical wire hole in the back, (where the original two-sided tape adhesive wasn't adhering). They are replaceable as a complete unit, but there is no way to get inside one without destroying the welded plastic seal.
If it does become unstuck from the endcap, (probably due to an air bubble from not being aggressively pushed on during assembly), any moisture or dust will render the adhesive useless and it will eventually, (very slowly, or ridiculously fast, take your pick), continue to come off until it's dangling from the wire.
If one comes loose, I would probably try some Heavy Duty exterior-grade waterproof 3M two sided tape after cleaning the endcap surface and the back of the lens assembly. The two sided tape that was originally used by the taillight assembly OEM was probably the same or very similar stuff.