why my phone stuck in bootloop?

I bought samsung s6 edge plus three months ago .. Automatically the phone update it self two times to android 6.0.1 .. in the third time the phone stuck in bootloop ,, I tried every trick but no result .. wipe cache partition . hard factory reset .. and flashing it with firmware . tried many different firmware . even downgrade it to lollipop 5.I tried every Solution I found on internet .. no matter what I did It stuck in bootloop .. some times it open and work just fine then , reboot it self and stay in bootloop For hours and maybe days .. please guys help me

See [Samsung] How to flash Stock ROM via ODIN. Find the stock ROM and flash it. If that doesn't fix it, you have a hardware problem (and the phone has to go into the shop).