still the same problem with me
[2018-09-26 22:39:50] JSON decode failed(1): unable to decode byte 0xe5 near '"'
[2018-09-26 22:39:50] GPU #0: MSI GTX 1080 Ti, 3798.12 kH/s
[2018-09-26 22:39:55] GPU #1: MSI GTX 1080 Ti, 4167.50 kH/s
[2018-09-26 22:39:55] JSON decode failed(1): unable to decode byte 0xe5 near '"'
[2018-09-26 22:39:55] GPU #0: MSI GTX 1080 Ti, 3810.28 kH/s
[2018-09-26 22:40:00] GPU #1: MSI GTX 1080 Ti, 4164.34 kH/s
[2018-09-26 22:40:00] JSON decode failed(1): unable to decode byte 0xe5 near '"'
[2018-09-26 22:40:00] GPU #0: MSI GTX 1080 Ti, 3811.96 kH/s
What is your driver version? it must be minimum 398.11. Maybe too much overclock?