My Euphorbia Obesa is rotting :(

[I like plants]

Well, the title says it all. My Euphorbia Obesa is rotting. When I touch it, it is kinda mushy and soft. It wobles a lot(probably root rot ). Only a part of the plant is really bad.

Is there anything I can do? I really like it. I have it my room for now. Away from my other cacties downstairs. I will not water it. Will I be able to save it or is it gone?

This is the second plant that is rotting. This is getting really strange. Can the really hot weather and humidity create that? I usually water this plant every week or two week.

[Barry 1]

well I'm not shure how to or if you can save your plant, but maby your soil isnt draning well enough, or your over watering or both, try switching to a more course well draning soil and try watering it a little less.

[I like plants]

Yea, for now I will not water it. Just let it dry out completely. The soil seems fine thaugh.