mine stop counting at 28 percent then started again now has stopped at 48 percent i have plenty of saved video footage i should have been done this quest weeks ago but they just stop counting. there's been so many complaints about this for so long i think Bungie is purposely throttling the progress otherwise the issue would have been addressed by now and fix. plus i think they should do away with the medals cause lets not forget that most of the people that did this quest did it when you could just pop a rally barrier or a rift and unload all the grenades that you had one after another with the automatic reload now that they did away with those perks it makes it ten times more difficult to achieve.