Serious lag and internet issues after One UI update (Android 15)

Hi everyone,
After updating to Android 15 and the new One UI, I’ve been experiencing major issues on my device. Gaming performance has dropped significantly with constant lag, and more importantly, I’m facing a strange internet issue.
Even though my phone shows a stable 4G+ signal, the internet completely stops working—I can’t even do a simple Google search. The only temporary fix is to toggle Airplane mode on and off.
A friend of mine with an S24 Ultra is having the exact same issue, so it doesn’t seem like an isolated case

idont know its a region problem or what 

buy i think is worth cheking

thanks you