As long as I have paid any attention to the metals market, there have been people saying that the paper and physical markets are coming apart and that Comex is about to collapse. Hasn't happened yet.
As far as premiums for physical: The meaningful premium for the physical commodity metal is that on 1000 oz bars, which are the financial standard. These are modest now, nowhere NEAR 50%. The premiums on ASE's are related to retail fabricated products, in particular ones that are made by the US government. People who claim that premiums on ASE's represent premiums on silver as a commodity are people who COMPLETELY do not understand the difference between wholesale commodities and retail fabricated products. The common clay of the New West, you might say.
As far as ASE's in particular: I think that the Mint, which buys its blank planchets from vendors, has changed their contract, in a way that made it a little cheaper for the Mint, but reduced the extent that the vendors have to sell as much as the Mint wants. At the moment, it is more profitable for these vendors to sell the planchets to others, so the Mint has less supply of planchets, so they are not minting as many ASE's as they would like to, and that there is demand for. Perhaps this was a poor choice for the Mint, but it does not in any way represent a breakdown of the commodity market.