Marc, my Base3 automatically joins my home network every time it starts up and my iPhone, iPad also join that network and find the Base3. I haven't had any trouble since the original setup when Base3 first arrived.
As ToledoEd said, the power and control Lionel site is helpful. But, I am very disappointed that the TR function on Cab3 used to control Legacy Powermasters hasn't been fixed. Yes, I know Dave said he is working on it. Yes, I use my Cab1-L to control the Powermasters. And very disappointed that the power/control Lionel website detailing the TR feature (for track control) still reads as if there is no problem when it has been known for so long. I spent a lot of time trying to make the TR feature work (and I am sure a lot of others did too) before I posted on the forum and Dave responded that it was the list of things to fix.