The prefix "crypto-" originally meant "hidden". Now, due to its association with "cryptography", the prefix has shifted to mean something more like "secure" when used in new words, e.g. "cryptocurrency". This may be mainly due to the relatively few number of words in common usage that use the "crypto-" prefix with its original meaning.
Another example of this is "hyper-". Originally it just meant "over", but now it's often just a short form of "hyperactive", the word it's probably most often associated with. Because of this, the prefix now has a connotation of "out-of-control" or "high energy". "Hypersensitive" (at least to me) sounds a lot stronger than "oversensitive".
Is there a term for this phenomenon? If so, I'd be interested in what other prefixes/suffixes changed their meaning like this.