Blinking text in Libreoffice Version: 5.1.4.2 Writer not fixed by unchecking blinking box.

i have continuous blinking text in my .rtf (Libreoffice Version 5.1.4.2), regardless of attempting to address the issue via format>character>font effects>blinking & unchecking the blinking box, this allows for a temporary fix but when doc is saved & reopened blinking reappears, is there a permanent fix to this annoying issue once and for all. any help & advice is most appreciated. thank you.