I also have the network extender. I've lived in the same house for 18 years and had Verizon since it was Celluar One and ever since they turned on 4G in our area (which is on both sides of where I live, but not where I live) I've been dropping calls. I've switched to several different phones thinking that might be the problem, but they all dropped calls.
Anyway, I got the S3 on drop day, broght it home, fell in love and then the calls started dropping. I kept the phone for a few days and then returned and went back to me Razr as it hadn't dropped calls as long as I sit upright on the edge of my couch when talking. A rep at Verizon told me one day the next week that the "Updated" sticker on the boxes of S3's after drop day meant that they had updated the radio and I should try again so back I went and bought another at full price again. Got it home and no luck. Took it back to the store, and went back to my RAZR and in the process got banned from a local store for returning my phone too often... (Remember I paid full price for these things and the $35.00 restocking fee each time) anyway got back home call Verizon in a rage over being banned from said store, got pushed to upper management who actually listened to me for once. All I want is a phone that will make and receive calls at ALL times, everything else the phone does is just icing on the cake if the damn thing works.
Very long story short (trust me, this is the short version) the rep sent me a network extender free of charge. Got the thing in the mail 1 day shipping and hooked it up and dialed the #48 or *48 which ever it is and got the message that I was connected. That was on Monday, Labor Day. Everything was fine, got used to the beeps when dialing and everyone said I sounded better until Thursday.
I missed 5 calls that I know about becasue my friends texted me when I didn't answer, the calls went straight to voice mail, but I received no notification on my phone, the Razr, that I had missed the calls. I'm laid off right now and waiting for the call to go back to work, so needless to say I'm very cheesed off right now. I've unplugged the extender and so far I haven't missed any calls today, but I also haven't been able to sit down while talking on the phone either.
I don't know if my rant will help anyone, but, Yes, my network extender flaked out yesterday too. Since it was free I really can't complain to Verizon about it not working I suppose, and at this point I really don't think they care anymore.
Oh and one more thing, in a late night, no voice of reason around decision, I purchased the LG Intuition. I know don't laugh... anyway, got the phone today and it's already back in its box, ready to go back to Verizon. I thought that since it was bigger it would work better... not... I'll stop now and let y'all get back on topic. Tomorrow I'm going to go back and get an S3 and try it once again, but this time with my extender and see what happens...
Cheers!!!