I can confirm that there seems to be an issue with Evernote on the Google Pixel. I have a Pixel. Yesterday I signed into Evernote and used it just once. Today I noticed my battery was running low at around 1 PM, when usually it lasts all day. Android's system settings say Evernote has used 39% of my battery and kept my phone awake for 4 hours 53 minutes despite me not using the app today at all.