Getting this a lot lately...

[2018-02-22 14:56:22] CPU #1: 68.93 kH/s
[2018-02-22 14:56:32] tribus block 590276, diff 932.144
[2018-02-22 14:56:32] CPU #3: 69.19 kH/s
[2018-02-22 14:56:32] CPU #2: 69.37 kH/s
[2018-02-22 14:56:32] CPU #4: 69.58 kH/s
[2018-02-22 14:56:32] CPU #7: 69.18 kH/s
[2018-02-22 14:56:32] CPU #6: 69.40 kH/s
[2018-02-22 14:56:32] CPU #5: 69.51 kH/s
[2018-02-22 14:56:32] CPU #0: 68.99 kH/s
[2018-02-22 14:56:32] CPU #1: 68.89 kH/s
[2018-02-22 14:56:34] stratum_recv_line failed
[2018-02-22 14:56:34] Stratum connection interrupted
[2018-02-22 14:56:49] tribus block 590277, diff 1075.551
[2018-02-22 14:56:49] CPU #5: 68.65 kH/s

What does it mean? What do I need to do?