I have this exact same problem. I live in the country with lots of trees and we get power blips and internet outages all the time. I’m constantly going out to the garage to power cycle the timer.
I also tried to set a static IP in the b-hyve and had no luck doing so. I could only get to that with the phone app. The PC app would be much easier, IMO. I would turn off DHCP and the screen would immediately go back to the previous screen not allowing me to enter IP information.