Why did the birds stop coming?

I hung two bird feeders outside of my kitchen window. One was a tubular seed feeder and the other was a suet cage feeder.
There had never been feeders there before this time.
Three days went by before a single bird showed up to feed.
And then, all of a sudden, there was a lot of feeding activity with numerous birds coming to the feeders. For about three days the birds were all over the feeders.
And then they stopped coming. I mean it wasn’t gradual they’re not coming….they all stopped coming to the feeders at once. Bang!
So, I go out to see if maybe a cat or something was changing the scenery. Nothing changed.
So…..why would birds all get together and make a decision not to go back to a feeder that they seemed to love?