I need some chicken advice from some very seasoned chicken keepers. As I have owned chickens for years now without an issue with my birds yet. I recently lost 2 adult birds several days apart. The day before they died I noticed they were acting weird. My rooster still look beautiful but was acting like he was on pause. He would just stand in a position or sit in a position & move nothing but his eyes for several minutes until i made him move. That evening behind where he was sitting was a large weird, stool. Next morning my bird was dead. We started probiotics. Couple days later, similar issues with a hen.We believe she also laid a egg that was squishy with nearly no outer shell that day. We immediately isolated her, and cleaned everything out of their area(including roosts) & then washed it out with bleach water. Hen died the next day. I thought maybe all would be well since the other birds looked great & we disinfected EVERYTHING. But last night i noticed our pet chicken had what looks like diarrhea on her back side. She is still acting fine. We put a chicken antibiotic in their water. I have read the story's chicken book but I haven't been able to narrow down what is going on with my birds. I could really use some chicken wisdom here. Thanks in advance guys!