Definitely the platform. 
I originally wrote a long response to this, but then realized I don’t want to turn this particular thread into a discussion of stability issues. There are already lots of threads about that in the forums. I’d like to keep this thread specifically to discuss low-cost home automation and accessibility. (Or a phase by phase approach to home automation investment.)
So instead, I’d encourage taking any follow ups on Platform reliability to one of the current threads, such as the following: