Half of light strand out, then magically came back on
Putting up some Halloween lights. (Assuming this is allowed here?). Plugged them in and half were lit, while the other half was out. Went off to get some other decorations and work on a few things. Came back, and now the full strand is lit, minus one single light. I didn’t do anything to them between when I left and came back.
Any idea what would cause this? Any cause for concern with the strand? Not trying to have these malfunction and catch fire or something.