weird issue last night, I'd expected AM to have switched, but appears one of my miners was stuck in this loop for hours! I manually took hashrefinery off the pool list and restarted the miner to fix it. Anyone know why it didn't switch and how I prevent this happening again?

[2018-02-07 19:57:25] Stratum connection failed: Failed to connect to yescrypt.us.hashrefinery.com port 6233: Timed out
[2018-02-07 19:57:25] ...retry after 10 seconds
------snipped---------------------
[2018-02-07 21:44:38] Stratum connection failed: Failed to connect to yescrypt.us.hashrefinery.com port 6233: Connection refused
[2018-02-07 21:44:38] ...retry after 10 seconds