Transparent white horizontal lines Benq XL2411

2 days ago i noticed these horizontal lines; there are 2 of them, one upper, one mid monitor. i know for sure it is monitor related because, as you can see, the turning on phase of the monitor still has the lines. what is this? what can i do to fix it? is there anything i can do or do i need to replace?

if the monitor has been shut down during the night and i turn it on in the morning, it works fine for about 10-15 mins, and then the lines appear again and last until i repeat all this (so they disappear for a bit when the monitor cools for a long period of time)

thanks

https://postimg.org/image/6yhx9xtpqj/

https://postimg.org/image/94hbvpll7f/

edit: just realized i posted in the wrong category
Reply to Proxxey
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