I have seen a couple times my node stall due to exceeding the thread limit, caused by an absurd 333 "HTTP socket handlers" (86.7% of thread usage). (My node's thread limit is 300).
I believe this is caused by my browser (dillo) making too many connections to fproxy. But, nevertheless, shouldn't these threads / sockets die after a few minutes? They were all still alive after more than 10mins of stalling my node, after which I had to restart to get things flowing again.