unable to render in 4k anymore, error message about my graphic card, help pls

Hi guys since yesterday UE5 refuses to render my clips in 4k, I get an error message regarding my graphic card saying "out of memory trying to allocate a rendering resource,..." .
I've always managed to render stuff in 4k despite having just an RTX 3060 Ti 8 vram.

Could it be because of my disk space? cuz i'm with only 50gb left and yeah I gotta buy a new ssd.
The final clip would just be around few hundreds mb tho.
Otherwise what could it be? I didn't change anything into the scenes or changed stuff regarding quality and resolution.

Could it be because of my limited disk space? or is it something strictly related to just my graphic card? need some help to better identify the problem and looking for a solution pls.
TIA. :)