I've been taking D as well, and got two colds almost back to back from my kids as soon as they went back to school. I'd agree it's probably the distancing.
Are there other reasons you'd continue to take it?
I wasn't taking it to prevent colds in the first place. The main thing that spurred it now is that Vitamin D has been shown to reduce the severity of covid infections. But being up in Canada I assume I'm deficient, so it should have multiple potential benefits. Eventually I'm planning to test my level to confirm, but for now I figured taking it is safer than not.