Same here. iPhone XS Max. Had no issues with 14.2 or 14.3, nor 14.4 that I can recall. 14.4.1 seemed a bit more draining... but I could still get 2 full days. Now with 14.4.2 I’m lucky to get a full day. Went from 42% at night before I went to bed, woke up with a dead phone. What gives????