I've got two bonded females who just wont shut up. I owned guinea pigs as a younger child and my family currently also has a pair of bonded boars. We used to pet sit as well. In my experience with guinea pigs I have never had guinea pigs be this annoyingly loud. We adopted them around 6 months ago just after they turned 4 years old. They have been consistently loud, they will pointlessly scream at all hours of the night and then throughout the day as well. I used to get very concerned because we assumed they were fighting (something they do occasionally do) but the majority of the time they'll be sitting far away or close or even snuggled up together from just screaming and making various noise. We separated them for a night and one was fairly quiet until feeding time but the other was still consistently screaming. I've got them in my room and its begginging to really effect my sleep. I'm a full time student and an athlete so I cannot be regularly tired throughout the day. They have a consistent feeding schedule of veggies and a small amount of pellets, unlimited hay and water and have a decently sized cage. They get about an hour of floor time a day and if the weather permits, we go outside in the grass. I expected them to be more like all the other pigs we've cared for, easy to care for and fun to have around. We will have to rehome them if this problem cannot be fixed.