I was also experiencing this issue with the official 4.10.0-21-generic kernel; I ran the ~lp1674838 kernel for several days, and have been running the -22-generic test kernel for a couple without problems.
I was also experiencing this issue with the official 4.10.0-21-generic kernel; I ran the ~lp1674838 kernel for several days, and have been running the -22-generic test kernel for a couple without problems.