I'm experiencing an unusual CPU usage on pantheon-mail idle - (40% - 50% of CPU or higher). However, when the process is killed, everything goes smoothly (as usual). This high CPU usage reduces significantly my laptop's battery life (instead of having screen 7-8 hours I'm getting about 3-4h). Any ideas about how to get rid of it without constantly killing the process? (once killed, no notifications pop up...etc, so I'd like to keep the default settings...).