Hi,
been having the same problems with wired Ethernet (OS3.0) like everyone else on this thread and found a solution that works for me. Appears port 80 is a bit noisy and by changing to an obscure and unused port like 8012 problem with controller lock ups have ceased. Been about 2 weeks and so far so good. Just need to make sure you change port in controller settings and forward that port in your router.
Cheers