I suspect VZW is behind it. They don't like us using lte to watch Netflix on tv. Like on my Note 3 vzw limits Netflix to 720p even though phone capable of 1080p. I complained to Netflix and they said VZW asked them to limit it. This means I can connect with mhl through Note 3 hdmi but only get 720p which sucks on big screen. V20 uses slimport connection to hdmi but Netflix and hdmi connection itself. drop off after a short time. I suspect vzw again.
2 things...
1) Isn't throttling (limiting the bandwidth) not allowed unless it's disclosed...this sounds EXTREMELY sneaky to me...at least T Mobile is upfront about it. I'd be irate about this but I use it so infrequently, and when I have used it on a 55" t.v. I've been fine with the quality... and
2) I think you should call Netflix and report what you are experiencing. I am very convinced what I'm experiencing with the ScreenBeam is in fact an issue that Netflix introduced in their own app...hopefully inadvertently (i.e. a bug). I realize your issue is different than mine, but Netflix told me the more feedback they get the better they are able to respond. If no one calls they won't look into it. I was pleasantly surprised with my call...found the number on the Netflix help site and was patched through in less than a minute of hold time. Super pleasant woman and I really felt my complaint was heard. Hopefully now it gets fixed.