Silver has the distinction of being an industrial metal as well as a historically precious, monetary metal. This generally means that there are numerous, not just one or two, macroeconomic forces working on silver that transcend normal technical analysis.
There also seems to be, from time to time, large “over-night” moves in silver that do not match a traditional non-correlation to the US Dollar.
The silver futures contract has also been the subject of talk regarding price manipulation by big financial players. Indeed there was a CFTC investigation that lasted for years regarding manipulation of the silver price.