My tvonline has a great video have some video issues at peak times am on a 15meg D/L but only getting 7 max, my IP tech says my modem is the limiting link and have a new one on order so hoping that will help at those few times of poor internet delivery.
Did you check system display to make sure it's on 1080/ or 4k/2k if you have a Uhd tv sometimes updates change settings and we just had an update > just a thought.
Most channels are 720*480 or lower, and some are 1280*720. No matter what internet connection however fast or slow, It will not change the quality of stream. Now where you say "slow panning, kind of like a slow motion picture but faster, Blurry when changing scenes" is their encoding process that makes this happen... I think they need better encoders or a higher bit-rate of transmission.