If it started in past versions, can’t expect new versions to fix it, as streamfab may or may not be aware.
Might be better off contacting feedback via Member Center
I am sure too you must have tried to delete streamfab cache, even if it does 5 and over.
Howdy is a pay add-on, does Roku do it for shows just available from Roku?
If not, maybe it’s because of going through Howdy?
I stopped using Roku because of slow downloads, but it seems they may have fixed in 6261.
I may try later with something just Roku.