Thank you for this information, I suspected it because I noticed that some failures occur after a restart following a long period of shutdown. Now as soon as I stop the miners, I try to store them in a dry place.

I also noticed that very often a miner crashes due to internet instability. I think that internet network instability must reveal bugs in the miner's software. Since the software also manages cooling, it can turn off the fans while the hashboard is still working... I think I've had cases like that on S9s.

I had an S17 but it died pretty quickly.

The S19s were a little better. out of 4 I still have 3 operational.   

In the case of the S19 Hydro, it disgusted me so much that I haven't looked at it yet, but it fails during operation, just after a network outage that lasted a few minutes. it doesn't come from humidity. I will keep you informed.