Thunderbird and pc crashes

Both my laptop and desktop suffer problems after the latest patch on 11th of June. The desktop running under Windows 7 Professional does not respond at all after I have not been using it for 5 minutes (Thunderbird being the only application I keep running when afk). I can not even get into the taskmanager. On the laptop (windows 8) the problem only concerns Thunderbird itself. After a short moment away from the keys it responds gradually slower, untill it reaches a point where it does not respond at all. Waiting sometimes fixes it, but not always. I already disabled and removed the add-ons, but the problem remains.