after updating to 8.173, the http proxy keeps stopping routing web page traffic after between 2-5 minutes of activity until system is rebooted. Other services seem to be ok such as smtp proxy. changing config, disabling http proxy antivirus, disabling url filtering etc all didn't seem to help.
so far nothing seems to pop out in the proxy's log file. I'll test again and post the section of the file around the time where it is stopping.