my trend security has uninstalled itself a couple of times since purchasing this year. Why is this?

Hi suejaneb1

Update to the 2019 version maybe will make the difference!
here

Hope that helps.

Kind regards
Tom

Hi suejaneb1, 

It's possible that the program automatically upgraded itself to the latest version. Along the process, it uninstalls the old one. As I checked, you're now using the latest version so if this happens again, which is very unlikely, please take note of your last computer activity (e.g. what you clicked, downloaded, etc.). Then advise and we'll have it checked. 

^X