I've farmed some radiant crystals as well - enought to fully heat up several weapons. So I'm in safe for now.
Yet, I agree, the drop for radiand fire crystals is ridiculously low. When I finish a danger mission on elite difficulty for Vanguards, I expect at least several 5* crystals, not over 30 of 4*. I ran with my friend few days ago through whole arcade (0-29) on elite. How many 5* fire crystals we've obtained? Insane amount of 3(!) crystals. Oh wow, I'm gonna heat up so much stuf with it.
For now, for me at least, the only one place I can farm radiants is (gasp!) FSC.
I don't expect to get radiants from every depth of stratas 5 and 6, but for god's sake! I hoped last bugfix would do anything with it.
To people saying "lol buy those from supply depot" - don't expect some people to pay 700 energy for 50 crystals. 100 energy more and I can have new weapon 5*. If those were cheaper - sure, I can buy some.
@Traevelliath
This what I was talking about. Whenever they do say something people take it as a sign from the heavens that that will happen for sure, no wonder they are scared of posting. I have no doubt they will fix this issue soon. Side note, I liked the lol to /laugh thingy, though I might be the only one.