Hi
The same error is also known to occur if you are monitoring a high number of markets at the same time, e.g. 3pm Sat football markets, and the program may run out of system resources. If you think this may be applicable to your situation, consider reducing the number of concurrently refreshing markets.
The number of login attempts refers to using the command line to start the program.
From your description it does sound like your internet connection, and the program really does need a stable connection to function properly. It might be worth running some tests
http://www.netmeter.co.uk/ to check your connection.
Also, you mention around 3pm. Please check you computer does not run any antivirus scans, backups, downloads or intensive system resource applications around that time, as these will certainly be a problem.