Hotlinked Images - Work Fine For a Minute Then Broken

Users can enter images directly into forum posts by entering the URL - exactly like this forum - so that they display inline. However, after about a minute, 75% of the images display as a broken image.



Questions:

1) Is this b/c the website my users are linking the image from has hotlink protection on through .htaccess with code like the following:

RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?samplewebsite.com [NC]
RewriteRule \.(jpg|jpeg|png|gif)$ - [NC,F,L]

Code (markup):

2) If that is the case, can I override this somehow so that the images not appear as broken? If that's not the case, can I add some sort of code to my .htaccess file to prevent this image breaking from occuring?

Thank you!!