So I'll jump straight in here, about 2/ 3 years ago I purchased a Brinsea mini advance, I've had several hatches from it, chickens, ducks and even pheasants. most at 85-100% hatch rate, particularly to the end of last year I was getting 100% hatch rate. I've read loads of forums on hatching, humidity levels etc so like to think I'm not a complete novice. However this year has been a bit of a disaster. Earlier in the year I purchased 6 eggs at a sale and they all appeared infertile, so no babies. However I did not investigate this because I simply assumed that was the case as I could see no growth when candled. But I was away for 5/6 days (I left 2 days after I set up the incubator). so I recently purchased eggs online, I bought 6 so placed an egg of my own hens in just to make it up to 7 (the incubator maximum). 2 of the eggs were infertile (no growth when candled so I cracked them open after about a week and no sign of fertility at all) one of the eggs was cracked when it arrived so again, no growth. However the other 3 and my own egg appeared to be developing, after approximately another week one of the purchased eggs stopped developing and had died. I've never had death at this stage before so wasn't sure what caused it. The other 2 purchased eggs continued to grow as did my own egg. However this morning I have found them all dead, I candled them 2 days ago and they were all fine but today there was no movement and they should have been going into lockdown today but they were no where near developed enough. I have left them just in case but I'm pretty sure they are dead. The reason I'm so confused is I did everything the same as before so I don't understand what has gone wrong. However the incubator was making a different noise from before and this morning was showing the symbol that suggests there was a loss of power, but our power never actually went out. Could this have caused it? I'm wondering if I just need a new incubator. Any thoughts? 
