I suspect so, because earlier today, speed was perfectly fine in the morning until afternoon. Then suddenly the quality dropped back to 0.50-0.90kbps.

Shouldn't be a hardware issue, replaced everything. Router and modem.

Same here, since they said they fixed the AAG cable which broke down (few weeks ago) my unifi vip5 has been very slow for everything except torrent is normal. Youtube can't even load 90% of the videos at any quality 144p also can't, takes forever to load..

I just checked any file i download is being throttled from 30kb/s - 70kbps.. You guys can try check:
http://www.thinkbroadband.com/download.html
https://www.linode.com/speedtest

Just download any of those file or whatever  file normally without download accelerator you will notice at first the speed starts out high then slowly drops to the throttled amount..