Something a bit like this?


As said by others its normally a case of the card being too hot & should go away if you cool it down.
If the card is covered in dust, fans not running &/or ventilation slots blocked with dust then cleaning that out can improve things.

Make sure there is plenty of room for cool air to enter the PC & for the warm air to get away.

Depending on how the computer is setup & how hot wherever you live gets, it could be that the computer fans can't cope with the heat.