@Darkness93_yt Hi mate i think i have a solution, at least for me anyway i got to play a fair few games without any crashing will give it more time to see if it is an actual fix or not but so far so good and i know i would've crashed a few times before doing this.. My GPU has 2 PCI-E slots and i used the single PCI-E cable for the 2 slots on the card, as you can see by the picture the Red line runs from the Green connector and most likely isn't feeding the other slot enough juice when the card needs it which the green line runs direct from the PSU with no break offs so will get the full power, i connected a 2nd PCI-E cable and used the connector on the Green line to plug into the other slot on my card so now i have 2 PCI-E cables connected to both slots that run direct from PSU with no break offs just like the Green line and since doing this Apex has ran great!
So for the 3090 i'd connect one cable per slot on the card using the Green line in the picture to each slot and tuck the Red line away as that's the break off part we don't need, give that a go and try Apex and hopefully it solves it mate