Do you experience a delay when opening the phone ?

[CtxPixel]

Like 90 percent of the time the phone opens normaly but sometimes there is a delay or a lag it's pretty annoying. 

[Samsung_specialist]

We sincerely apologize for the inconvenience you're facing with your device.
Please follow these steps to address the issue:

Utilise the features in Device care
Check to see if your software is up to date
Restart your Galaxy device
You can refer to this link : https://www.samsung.com/ae/support/mobile-devices/why-is-my-phone-slowing-down-and-how-can-i-speed-i...