I am running Windows 10 Pro edition. This has happened to me before too and in fact, it happened again this morning. I just X out of all applications and lock my computer at night and do not restart every night. I did this last night and when i tried to open RC phone this morning it would not come up. It showed in my task bar but didn't come up. I had to restart my computer. It works after a restart, but shouldn't be an issue in my opinion whether i restart or not. i have also been getting crashes when trying to answer the phone periodically as well. i keep trying to do the 10.3.5.34099 update (thinking that will resolve my issues) but keep getting an error message. I am having my IT people look into getting the latest version downloaded.