Hello Arnold,
Thanks for getting in touch and I’m sorry for your troubles.
When does it deactivate itself? Right after you activate it, or sometime later at a random time?
Is there maybe a specific action you are taking when this happens?
Does this also happen if you deactivate all other plugins and switch to a default theme like twentysixteen?
It would also be great if you could run a test for conflicts based on this guide. I understand this is sometimes not possible on live websites, in these cases we recommend setting up a development / staging site, possibly on the same server to have the same working environment.
Thanks,
Andras