I'd assume that if 1/4 die, then why haven't you at least started putting in a 1/4 LESS than what you already are? Bad idea to begin with. WAAAAAYYYY too many crickets running loose. You say you have had zero problems so far.... SO FAR, Till the crickets eat your cham alive in its sleep or bite him to death :-(
My question is, if you don't have anywhere to story that many crickets, then why are you getting so many at a time? Are you getting them from a local store (which can sell you smaller amounts, I'm positive) or are you ordering them online and that's the smallest amount you can purchase?
If you ARE getting them online, then they will come in a box with egg carton to climb on 99.9% of the time. So um, like.... keep them in that and gutload them in that and only drop a few in the cham cage a day as needed? Would be SOOOO easy. You wouldn't have too many roaming the cage and you wouldn't have them all dying. And you could dust them and NONE of it would be coming off by the time your cham got them. IMAGINE THAT, saving calcium dust AND crickets!
OR..... if you are getting them local (or even if you get them online) ---- how hard is it to go to a Petco or Petsmart and buy a cricket keeping bin? There are small and large sizes available. Or you could order one online, off of Amazon. Very easy to do. ORRRRRRRRR > go to Walmart, buy a good size plastic tote or plastic container or tubberware. And poke lots of holes in the lid of it for air or rig up some screen as a lid.
All of those are very easy to do. Dropping 100 crickets in the cage at a time is just very, very bad. A very big no no. If you researched chameleons like every chameleon owner should, then you should already know the dangers of doing this. That, and you are throwing money away with crickets dying on you. Take that money you are throwing away, and invest in a bin or container for them. You own a chameleon - already expensive hobby. A cricket keeper bin is like, $10 for a small and $20 for a big. Or a plastic tote or container would run in that range to. Much better if you do this.
I get 100 crickets every two weeks. And use them as main feeders for my cham and throw in lots of other insects here and there. I gutload them crickets for two weeks. I buy them slightly smaller than I want them because a good gutload after two weeks and your crickets will have grown some. I keep 50 in one container, and 50 in another. New food in the cricket dishes every three days, and clean them out once a week. Guess how many of my 100 crickets die in two weeks? 2. maybe 3. 4 or 5 if I'm having a bad two weeks. That's WAAAAAYYYYY better than 1/4 of your dump dying. And when mine die, I immediately take them out of the cricket bins when I find them. You don't know why your cricket died. You never do. Did another cricket attack it and kill it? Did it starve for some reason? Was it diseased and died? That's why I take mine out. Your method.... your cham will still eat a dead cricket. Now, that virus your cricket might of had that killed it, is in the belly of your cham. I see a vet visit in your future...... :-(
Not criticizing you... to each his own I guess.... I'm just giving you valuable advice that I hope you will at least think about......