This happened to us last year.  I went rounds with 3 different techs at Lacerte, plus our company IT. One Lacerte guy helped find the answer.  The link is : 

https://accountants-community.intuit.com/articles/1616319-common-settings-for-lacerte-system-adminis...

I hope this helps you.  After our IT did the steps in the article, we haven't had any trouble since.