Zambons Gone Bad?

I have some zambons that have been stored for a little over a year.

Pulled them out the other day and found that they had started to become solid in some spots. Another person who viewed them also thought they looked like they had turned somewhat yellow.

Well, we shook one up for approx 30 seconds and almost everything dissolved. Put one in, and did not feel so hot the next day. Thought maybe it was a coinkydink, but another one today confirms it.

User feels weak, cold/hot flashes, joint pain, tired. Symptons subsided within a day after the last shot.

Has anyone ever heard of this before? They are legit, and they are not expired. Thanks for any input.

Monopoly