I would like to disable the force update on the 25th day so feature as I don't need it with a NameCheap domain.
Taking a look at the code, it seems like there's no way to disable it. Maybe I could try to add something useful but meanwhile you could try to increase the setting to something like "max-interval=300d". I'm not very sure if the d-syntax will work but you could try it and post any result here.
It does appear a max-interval value of 365d is accepted.