I too have the same problem!
I am living in Jakarta, Indonesia (tropical climate).

Recently set up my own worm bins with 5 gallon buckets..
Bottom one with a spigot and the above one with perforated base. I also had drill holes on the lids and the sides of the top bucket. I put them outdoor at my balcony which is about 25-30 degree Celcius)

I had two attempts and the first one was a disaster.
Put in fresh and moist bedding (shredded newspaper and cardboard).
Ordered the worms (african night crawlers) and I immediately put them into the bucket with some soil and topped it off when food scraps and lastly dry shredded newspaper and cardboard.
The worms started dying and the contents was really wet and sludgy and it had a bad smell.
I also noticed some white coloured mites and small larvae on bedding, sides of the bin and on the surviving worms.
4 days later most of the worms died and I only managed to salvage about less than 10 of the initial amount which was about 1 pound of worms.

So I did more research and decided to give it another go.

I cleaned up the bins, washed with water and soap. Dried it out and then filled it up with fresh new moist bedding (very careful not to get it too wet) about 1/3 of the bin.
Ordered my worms and then introduced them to the bin with the soil that came with the worms. I also added crushed eggshells (zapped in the microwave for about a minute)
And then I topped it off with some dry bedding.
This time I did not feed the worms immediately I left them to be on their own for a week and they seemed happy. None of them died.
There were some tried to escaped but I escaped proofed my bin and some mornings I might find a few at the crevices of the lid but I physically put them back on top of the bedding to let them crawl back in.

After a WEEK, I decided to feed them in the morning but only one handful of fruits and vegetable scraps (kale, tomato, carrot and cabbages) and topped it off with dry bedding to avoid fruit flies or insects.
In the evening before sunset, I decided to open up the lid to give it a check and I found small larvae on the sides of the bin.
Topped it with a whole lot of bedding because I was afraid that the bin might be too wet.

The next morning, I checked the larvae has gone and disappeared and so are my worms!
I checked the bottom bin to see if they have crawled into the bucket with the spigot but I didn’t find any. I took out all the contents and did a check and I only can see about 1/4 of the worms that I had initially put inside.
The surrounding of the bin does not have crawl marks or casting trail I am just baffled to what happened to my worms?!
There are no foul smell just earthy smell. The contents is about 70% moist not to wet.

Could it be the larvae eggs from the first attempt had survived even I had clean them with soap and water before starting the second attempt? It came back to attack my worms and they died and decomposed quickly before I can even find their dead body?

It could be useful to have some advice. Thank you very much in advance!

I had seven trays of my worm farm and then we cleaned out four of them to get the castings. We found a ton of worms and added them to the other trays. I added another tray of food because we had so many worms. The next day there were six worms on the ground and a ton in each corner. I checked the temp to find it at 87 degrees! I added a ton of paper, toilet paper rolls and eggshell cartoons. I added another tray of food since there were a ton of worms. It was 90 degrees the next time I checked and six more worms on the ground. So, I put paint sticks between the trays to see if that would help. Please help me!!!

For the restart, I used shredded brown craft paper (moistened first) as the bottom layer, followed by a layer of composed manure (Moo-Nure brand). Next, I added some fresh veggie scraps that I had stored for a couple of days in a plastic coffee bucket under my kitchen sink. Then I put a layer of decaying wheat straw on top of the food. I plan to keep the worm farm indoors until this heat passes. I may go to the bait store up the street and get another container of worms to help replenish the supply and get things going again.

I rescued the eight worms that I found and started the farm from scratch in a fresh bin yesterday with food I had stored indoors. We will see how that works. I’ll check them in about a week.