I have also tried Stefan’s firmware. Unfortunately, it doesn’t seem to resolve the problem I’m having. I’ve now got a mesh system (before I had a single access point), and I think it’s a new variant of the problem (the unit drops off and back on randomly rather than just off and staying off like it did before) but it can’t complain about the strength of the signal now. Every other device in the house is rock-solid on the wifi, so it’s just an opensprinkler problem AFAICT. I still have a couple of things to try, but I’m not optimistic that this can ever be as reliable as something like this needs to be.