Google Pixel 2/2 XL owners complain about overheating and battery issues after February update16
One Pixel 2 owner says that his model warms up to a temperature as high as 45 degrees celsius (113 degrees Fahrenheit). He also figures that his screen on time has been reduced by 30%. Trying to fix this issue with a factory reset was unsuccessful; while turning on the battery saver mode did make some Pixel 2/2 XL units cooler, it did not help with the shortened battery life. Reading the posts put up on Reddit, you can almost feel the frustration coming from Pixel 2/2 XL owners, who have had to endure several issues with their phones since they were launched last year.
If you are having these problems with your Pixel 2 or Pixel 2 XL, you might have to wait for Google to send out an update containing a fix. So far, we have no indication that Google is aware of the issues, so you might want to drop them an email by clicking on this link.
source: Reddit (1), (2), Google