I also have this issue, but over the last 6-8 weeks i have narrowed it down to an anti virus conflict when the Articulate 360 updater process is running in the background. MY AV is picking up the updater file as infected with malware, and is halting A360.
This also gives me the issue that i cant run the check for updates process, and cannot install SL360 updates for either the live of my beta version; my AV blocks them every time as suspicious behaviour.
I have had the same AV software for 3 years, and have never had this issue before,. it has only started occurring for me this year.
I have logged a support case this morning, as it is getting progressively worse and preventing me from opening SL and doing my work. I am a freelancer without company restrictions and policies, so i know that is not the issue, and have had an IT technician look at my PC to resolve nay other issues. Basically my AV and A360 do not play nice anymore, and this causes some really odd behaviour when i can open SL.