This might be a starting point.
The OP nf the other thread never reported back so we could not help any further or some of the suggestions for his case did help and he just failed to tell the community which it was.
Since it's happening after a longish time, it's most likely some kind of overflow, mem-leak, connection loss issue or so.
The connection loss side you can test by cutting the connection from your router and the other things require a look at the code.