I would say there is definitely an issue on your end if you are missing them that often. Have you run an cleaner lately for adware or other things that could be capturing your cookies? I know it is frustrating when we say that but it is extremely uncommon for people to miss credits that often on one type of survey. That is a survey that is crediting well today and so it isn't an issue on their end. I am sorry I dont have a better answer for you. I would do a major cleaning on my computer and make sure there isn't anything hiding on there.