This is huge! Even if you find something you like that is in regular production from a large company, it can change out of the blue, without notice.
Stock up, Stock up, Stock up.
I have had some favorites that do not taste like they used to even though they are still in production, by the same company. The only thing I can think of is that the process changed a little bit or the components changed.
Some would argue that my tastes changed, which is very possible, but not to the extent that I have noticed in some blends.