Sorry, we were unable to connect to chat

I have been getting this error message for over a year now.
It only happens to me when there is no message being sent for a few minutes. (quiet chat channels)
Also, I have no way of knowing when exactly I get disconnected other than the error message:
“Sorry, we were unable to connect to chat”, that pops up about 10 min after the last message received.
I know I get disconnected beforehand because if I refresh the page after a few minutes of silence, I see the missed messages in the tiny little bit of scrollback that BTTV offers.

Since it happens 100% of the time, I guess it has something to do with my TCP timeout setting.
Because I only get disconnected if there is no chat being sent or received for a few minutes.
So… what is a recommended TCP timeout value? Or maybe I’m mistaken, any ideas?

Relevant info:
Can watch any stream just fine without flash. (html5)
Chat disconnects with and without flash installed.
Using Firefox 64 bit 45.0.1 (used to have 32 bit, same problem)
With and without BTTV plugin.
I haven’t tried any IRC programs, just regular Twitch chat.
Don’t have any problem with other TCP or UDP connections, all stable.
Edit: Windows 7 64 bit

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