I've experienced this and others I've helped have as well, seems like Sentinel out of the blue corrupts it's own config file.... if yours stops opening when you click the icon yet you are able to open it under a different user login, read this.... a reainstall does not help as that does not replace the config file that gets corrupted.
https://forums.radioreference.com/threads/bcdx36hp-sentinel.389221/#post-3134552
Jen
https://forums.radioreference.com/threads/bcdx36hp-sentinel.389221/#post-3134552
Jen