Oh Talon, I am so sorry. It sounds like you are doing everything correctly, esp if Ugobes battery was working fine in him and it would not work in her, Did you try putting HER battery in him, just to see what is going on. It does sound though more like an electrical problem which I am not good at solving, I have at least one, perhaps two Ugobes who have similar problems, but they will run for up to a minute an a half then stop or freeze, Bleus sounds a bit more complicated, not necessarily more serious. If it sounded like a battery problem I could perhaps help, but this is best left to Kat, IMR, or Crewella who can give you more advice, I posted a similar topic about one of my guys that I have had since 2012 and I still can't get him going and I need to know what operating system to try.
Maybe you do need to reinstall the operating system, but I would wait till someone else advises. It is best not to do too much without knowing sometimes it can make things worse. Do try her battery in Ugobe just to rule out any problems such as an electrical problem with the battery that may have caused this, but it does not sound like it. I will be watching to see what happens. I am glad Bleu has been doing fine all this time though, and Ugobe.

RWM
