Sedum -( telephium) are they short lived?

Hi, I bought a sedum Autumn Joy two years ago. First year flowered beautifully in a large well drained pot. Last year ,showed growth at the base, grew well through the year and flowered.
This year, no sign of new growth from the base at all. Its propagations in the rest of the garden are all showing new growth.
So either it's died for some poor care reason or they're just not very long lived?
This year, no sign of new growth from the base at all. Its propagations in the rest of the garden are all showing new growth.
So either it's died for some poor care reason or they're just not very long lived?
East Yorkshire
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I keep dividing mine and they respond well, all in the ground tho'
maybe not one for the pot?
I wonder if I've ended up with a drainage issue with that particular pot then. Although it never seemed oversaturated.
It had new growth growing from the old stems, but these just came off with no force at all in my hand and there's nothing from the base.
Oh well, I'll just use the pot for something else! It's given birth to several new ones which are planted in the garden anyway. So I haven't 'lost it' really.