So as soon as it starts playing the next ep w/o sound if you hit the up button and select restart it immediately starts over w/ sound.
If you hit the back button instead it boots you out of Hulu entirely and you then have to wait for it to "load what's new" before reselecting your show which may or may not start with sound from there.
I'm a bit embarrassed by how long it took me to figure this out.
Not a solution exactly, but it does help the situation suck less. Hope this helps someone as frustrated as I was.
Thanks for that but I am using my chromecast and Amazon fire right now. It sucks but it sucks less than watching video without audio (I did find that subtitles worked but I hate to "read" my movies....I would rather read a book)
I did share your keystroke workaround with a grandkid who looked at me with a quizzical expression that made me think of "Duh, Boomer!" Evidently he found his own solution!