na not really got connection lost when rented hashrate produce to many wrong shares ...
nicehash hasn't fully support at open-ethereum-pool based pools ....
Now we have a Hash-Rent-Support from Miningrigrentals.com
https://www.miningrigrentals.com/
For Ethereum Stratum take the "Dagger-Hashimoto(S) Mining Rigs for Rent" not the G!
To use: Without a worker password that work.
Butt the better way is all Time to build your own rig, like this
https://www.youtube.com/watch?v=t_Tun_47pMA
https://www.youtube.com/watch?v=PhU1KQJiSFs
https://www.youtube.com/watch?v=VUiOlqMeqIY
POOL HOME:
http://mastermining.net