Anyone with problems mining cryptonightv7 with nvidia? xmr-stak

Everything seems to be fine:

[2018-04-07 19:38:25] : Fast-connecting to cryptonightv7.eu.nicehash.com:3363 pool ...
[2018-04-07 19:38:25] : Pool cryptonightv7.eu.nicehash.com:3363 connected. Logging in...
[2018-04-07 19:38:25] : Difficulty changed. Now: 100001.
[2018-04-07 19:38:25] : Pool logged in.

but than:

[2018-04-07 19:38:25] : Pool logged in.
[2018-04-07 19:38:59] : Result rejected by the pool.
[2018-04-07 19:39:21] : Result rejected by the pool.
[2018-04-07 19:40:59] : New block detected.
[2018-04-07 19:41:48] : Result rejected by the pool.