Only sporadically connected to Nicechash Multialgo
The same situation is happening to me. The port for the most profitable coin is not open in multialgo mining.
Are you 100% sure that you have all the algorithms configured with ALL your NiceHash / WestHash pools/profiles configurations?
You have to configure pools/profiles with blank password ("pass") parametere for all multi-algo algorithms with default parameters, or if you want to select only a subset of algorithms you have to set fX=0 to disable a particular fX algorithm.
Please take a carefull look at the configuration examples here: https://www.nicehash.com/index.jsp?p=multialgo#examples
If you have proper configuration then multi-algo will work 100%. The issues with "all multi-algo ports being down" is always related to sgminer misconfiguration (some algorithm missing).