Welcome to ATP!
I lost a jade years ago in what appears the same way, but mine died too quickly to do anything about.
I thought perhaps the pot was too deep, which kept the roots too wet which caused them to rot.
I never found out for sure though.
I'll ask the question to people who know a lot more than me.
Am I even slightly right in my thought of possible root rot?
@gg5
@webesemps
@valleylynn
(Sorry to bug you all and thanks!
)