little while ago my 4900 started to lock up, won't power off, if power off won't turn on. I had to reboot to make it work then problem again both wired and wireless. thats where I found it was my cec settings on 4900 was causing issue. then I turn off cec settings and ever since its been good. maybe you can give a shot to cec and leave it off on box and see if that helps.
some providers dont care about anything. some lock with your ip, your isp, device id, geo location..etc. I like the one locks with your info so not easy for people to steal.