So you had no problems during the reflashing of the phone using Odin i.e. no glitching or freezing etc, only afterwards, is this about right?
Was the phone still connected to an external power source i.e. USB cord connected to the computer when the problems started afterwards or not?
If not, I'm wondering if it is a power problem with the battery.
Try leaving the charger connected and check what happens.
If it still happens then there is a hardware problem of some kind. Has the phone been dropped or gotten wet at all?
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=== Update (01/22/2021) ===
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Hi @wesamoooo11
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The only thing left to do now, as you have tried all the software remedies, is to open the phone and check that all the connections are secure and that there is no obvious physical damage to the boards or components.
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Here's the ifixit [[Topic:Samsung Galaxy S8 Plus]] guide that will help you to do this.
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If doing this seems too daunting, contact a reputable, professional mobile phone repair service and ask for a quote.
Hi @wesamoooo11
So you had no problems during the reflashing of the phone using Odin etc only afterwards, is this about right?
Was the phone still connected to an external power source i.e. USB cord connected to the computer when the problems started afterwards or not?
If not, I'm wondering if it is a power problem with the battery.
Try leaving the charger connected and check what happens.
If it still happens then there is a hardware problem of some kind. Has the phone been dropped or gotten wet at all?