Hi, I’m on the same version of Plex as well and having the same issue.
OS is Ubuntu 18.10 and at first it looked like the solution could be found here:
But neither disabling UPnP nor installing 1.14.0 or earlier did the job. I’m still getting massive CPU usage to the point the machine is almost unusable.
Does this mean I should just let it do its thing? Admittedly, I only recently reinstalled PMS and the scanner has only been running for about an hour and a half (though, I did experience this issue before and it lasted days which is why I removed it).
How long do you think should I wait and what else can I do to gather more data about this issue?