Got my interest what exactly are you hatching that’s eggs are worth thousands? Just wondering.I might have missed it, but is your incubator in a temperature stable room at about 70 degrees? The thermometers you're checking it against were calibrated and calibrated correctly? And re-calibrated recently?
I bought mine May of 2020 and I love it. It's sooo stable and reliable. I check it with multiple thermometers and it's always at 98.7-99.5 at all spots in the incubator. Cooler is always better and since I usually incubate duck eggs in mine 98 is great. I have over a thousand worth of eggs in mine right now, that's how much I trust it. I have two other Brinseas as well and they just aren't as good. I had two of those magicfly/janoel 12 ones and they worked ok for a while, again with constant tinkering to keep the temp stable, until one day about a year after I got them, they both freaked out and cooked my eggs. I can't get them to work at all now, they just went bad. I've used my NR 360 hard since I got it, running it from late April until August these past two years, and it's still perfect.