The thing is when you try to reattach after disconnecting it doesnt fit anymore. It is the weirdest thing it has nothing to do with putting the cap on after. It is like putting a square block in a circular hole. Just aint happening.
i get the problem, I even have "trouble" lining up the tubing connector to the infusion set to re-connect... it's just never happened (in about 360 sets) to me that I can't get it back on. dont' get me wrong - the alignment can be tough because the tubing uses a 3 prong system (2 alignment pins and the tubing end) that all have to make contact at the same time. I guess you could twist the infusion set during a disconnect, and then the little blue arrow and dash would be useless... but honestly I can't see 'em when I reconect anyway and do it by feel (I like the back of the love handles, impossible to actually see). anyway tomorrow morning I have a set change and will take a closer look in the name of science =) The original poster seemed to have a prob after contact sports - that's why I suggested the cap - I believe that if the sharp edge of the infusion set (when you're disconnected the edge of that thing can cut your skin... just ask my wife) and if it gets a ding in it then for sure the tubing cap wont go back on..... good luck all!