Never had an issue. I thnk some people do not use it as directed. That is the only way I can see you having a problem Always read, understand and follow the direction,
I bought a package bees back in May and about 2 months later I couldn't find the Queen or no eggs or nothing so I got another Queen and the same thing after about 2 months I couldn't find no eggs or not to nerve the Queen or anything and I would like to know what's going on