Team leaders no longer dropping sinnoh stones?

Up until 5 weeks ago; I did my daily battle with a go leader and would get 1-2 sinnoh stones a week dropped from the battle. Up until 5 weeks ago that is, ever since I’ve only gotten maybe 1 charged tm but otherwise it’s always stardust. I switched up which leader I battled today and managed to get 1 single rare candy… but still no stone?

I’m not super keen to get into PvP JUST for the sake of getting sinnoh stones…. It feels insanely hard to pick these guys up considering so many high powered Mons need them to evolve?

Has anyone else had the same issue? Do I need to lose the battles more and keep switching between leaders? Thanks!