I haven’t stayed at the AoA ever or the Poly in a few years, but I never had an issue staying on the WiFi on my phone there. My most recent visit to the world (last week) I found that my phone stayed 100% connected to the WiFi basically the entire time I was on property, save the buses. However, I tried to do a few things for work on my laptop (mostly downloading fairly large files) and really struggled in room at the Coronado and POR. I was finally able to do it in the lobby of the POR! So I wouldn’t count on being able to download things everywhere/every time you want to, but if you’re struggling definitely try a relocation.