This is pretty unusual. You should not have to reboot the proxy server daily. A few things to check.
1) The Balance proxy runs as a Java service. Do you have the latest version of Java on the Windows proxy server?
2) The Balance proxy writes intermediate data locally. It you have a real-time virus scanner installed on the proxy server, it can cause problems with larger environments, such as yours. To fix this, you can get a virus scan exception for the directories that the Balance proxy is writing to.
KB article.
Why should McAfee be disabled while installing the OnCommand Balance proxy service?
https://kb.netapp.com/support/index?page=content&id=3013255
3) The proxy server creates a log file in the root of the installation directory. A peek at that might reveal something.
4) If this continues, please open a support case, we can get to the bottom of it.