I did have one really strange problem after powering down the hub for a while then back on. My phone was showing connected and an app I have on it was showing the normal IP but there was no internet. I checked the hub and it was showing the phone connected but in a totally different private address range - I use default 192.168 and the phone was showing as a 10.n.n.n address. After a bit of fiddling around with the phone it was OK but the hub was still showing the 10. IP. Eventually the hub showed the correct IP again. I tried to recreate it but had no issues the next time.
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In the main R36 has been OK for me but TBH the only issues I had with the Superhub before (back on R25 iirc) were the abysmal wifi range and the fact that any sizeable network transfer using WiFi (especially in 300 mode) would simply hang the thing. I haven't given the WiFi any serious bashing on R36 but others seem to think it's OK now.