Every one of the “reports of reinfection” I have seen was along the lines of: tested positive continuously for 2 weeks, then tested negative twice, then tested positive again a couple days later. There is no evidence in any of the cases I saw that the person was exposed to another infected person during that time period.

This should not be called “reinfection” (even though there are a bunch of sloppy media headlines calling it that) but rather “poor test sensitivity during the last stages of the infection”.