It's been around a couple of weeks for me. Yesterday was the worst. I've noticed the forum is generally unresponsive in those brief moments. Like I will click and the wheels spin. If I wait I get the error or if I re-click I get the error immediately. (oops something went wrong)
If I kept track I'm sure it only happens during certain times of day, possibly related to high traffic. Yesterday was so bad that I was also going to make a post, but then I started looking through the site cookies and decided it was all too complicated.
I get days where it happens to me, too - I'll be browsing the forums and get booted to the 'Something went wrong' page for no apparent reason, several times in succession.
~~~~ Just another victim of the ambient morality ~~~~