One can try scanning the system files, playing in silly windowed mode or applying any of the numerous potential fixes, but it will not solve the freezing issue.
It is pretty obvious that S15 has been released in faulted state without proper testing and the only thing we can do is send those reports and wait for the fix.
Respawn/EA should be ashamed though because this is not how a critical bug should be handled. It is just mind boggling how many such flaws and oversights go through their quality assurance/testing departments without being taken care of.
Just as one small example: they had released Valkyrie without any normal way to cancel her tactical ability, like all other legends can do (by hitting the Holster Weapons keybind, switching weapons, mouse right-clicking, etc.) and they have not bothered to fix it ever since even though a lot of players noticed the issuse as soon as we playtested the Valkyrie in the firing range upon release.
How can a multi-million dollar company constantly and consistenly do such a poor job on the IP that is very lucrative and cruical to their business that they even plan to branch it out to other entertainment areas?