Also, please try a newer kernel like:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1.14/
or
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2-rc6/
and tell us if either of those improve the situation.
Also, please try a newer kernel like:
https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ v5.1.14/
or
https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ v5.2-rc6/
and tell us if either of those improve the situation.