Thanks for the quick reply, here you go config for the one that does that the most:
cgminer.exe --scrypt -o stratum+tcp://eu.wafflepool.com:3333 -u 1Y9My747MgN9jVovucztEKSgLengPrsm6 -p d=512 -o stratum+tcp://useast.wafflepool.com:3333 -u 1Y9My747MgN9jVovucztEKSgLengPrsm6 -p x -I 19 -g 1 -w 256 --thread-concurrency 24000 --gpu-engine 1100 --gpu-memclock 1500 --shaders 2048
I don't see a "--failover-only" setting in there, can you check while its running that failover is enabled (and that it has 2 pools in settings)?
Yes, if I go the cgminer settings the pool strategy is set to "failover only". That miner has only 1 backup set, others have usually 2 backups, but the behaviour is the same ( most configs are pretty same as use mainly 270s) - connection interrupted, xxx shares lost and not failover

A.