What Omegon camera's do you have? I have a Guide 2000M and have a lot of connection issues with it in INDI/Ekos. The camera works great with the ASCOM drivers but loses connection after some minutes in ekos. Sometimes it recovers, sometimes it doesn't. But it's not reliable at all. I tried so many things that I gave up on it. I really would love to make it work, because I love using Ekos-Kstars a lot.
That's exactly the same with my guide camera. I get the exposure time-out message. Not only in PHD2 but also with the internal guider of Ekos. If the guide camera is the only device that's connected it works fine. But as soon as I connect my mount or when an image is being dowloaded from my dslr. I tried different usb-cables, powered hub, directly connected to a raspberry pi with Stellarmate and even ran Ekos on my Macbook Pro, everytime the same behavior