Posts published to your LinkedIn personal account do not have insights (likes, shares, views, etc) due to the LinkedIn restrictions. This is also the reason why you cannot see insights for your personal LinkedIn account in statistics view. However, posts published to LinkedIn Business Pages and Business Page accounts have insights.
Unfortunately, sometimes the connection to your LinkedIn Business Page account is lost and thus the insights are not visible anymore. To fix that, try to reconnect the account again (but DO NOT DISCONNECT the account first as you might lose scheduled/drafted posts).
Read more about using LinkedIn with Hookle.