None that are on a timer. My usage is pretty low, probably 1-2 a day (open sockets, that is). The errors are definitely coming from the winsock, however when it crashes memory usage is so high Im assuming the buffer error is due to lack of memory rather than lack of an available socket.
I just made a loop to /hadd and $hget 10,000 times, put it on a 1 second timer and let it run for about an hour. Memory usage jumped by about 20mb total and 3mb for that instance of mIRC, so Im not so sure the problem is with hash tables.
