My 2015 pro running High Sierra has recently started running hot more often, causing the fan to run. Worse, the battery has gone from lasting 5-7 hours to about 2, doing the same activity (browsing the web). Any ideas about why the sudden fast drain? I don't know if it running hot is related or not; sometimes it heats up enough for the fan to run while the lapbook is plugged in. I have it sitting where air can circulate under the machine (not flat on a desk).