The problem is:
after restarting awesome miner the field "nicehash.com:443" will be overwritten back to "nicehash.com:9200" and the connection becomes impossible (because the alternative field "stratum+ssl://" keeps still active and miner tries to use SSL connection on non-SSL port).

This looks as a part of automatic synchronization process when awesome miner updates pools information.

So, I suggest you to add "Use SSL connection" option for nicehash pools, because user changes have effect only until next start.