Topic says it.. happend to me a few times during Blitz. After migration is complete, the character had it's default sponsors instead of the custom ones. It's super obvious when it happens while you're using Tank + Reload x3.. suddenly your spin attack becomes a liability while before the migration it's all you really need ..
I should really learn to read full posts before I post one.. my last 2 topics both mentioend already known issues... sorry.