I bought the TV in 2012 but never used the Smart Hub much in the beginning. A couple years ago I got a Netflix account and it worked just fine. Then a few months ago, I got an Amazon Prime account and at first it worked fine but lately it's not working correctly. Every time I want to use the Smart Hub, I must re-enter the PW to reconnect to my wifi network. It will usually then work for but for different lengths of time. Sometimes 30 minutes, sometimes longer but it will eventually freeze and the network PW needs to be re-entered to reconnect to the network. And on those times when it doesn't work at all, I have to turn the set off, disconnect the power cord, then start over. The Smart Hub/Amazon Prime works just fine if i connect an Ethernet cable to the TV but that's not a preferred mode of operation for me. Any ideas what I can do?