I was a little bit wary in downloading your Dump file but decided to do so.
According to your Dump files this is what I read:
Thread_Struck_Device_Driver 0xea - ATIKMDAG.sys
Unexpected_Kernel_Mode_Trap 0x7f - ATIKMDAG.sys
Page_In_NonPage_Fault 0x50 - DXGKRNL.sys
This is how to troubleshoot the DXGKRNL.sys BSOD: https://www.thewindowsclub.com/fix-page_fault_in_nonpaged_area-0x00000050-error
The first two dumps seems to be concerned with AMD Drivers. I suggest using DDU (Display Driver Uninstaller) in Safe mode with the internet disconnected. Once it reboots, install the latest AMD Driver with the internet STILL DISCONNECTED. Once installed, reconnect the internet.
Here is the latest R9-380 AMD Drivers from AMD Download page: https://www.amd.com/en/support/graphics/amd-radeon-r9-series/amd-radeon-r9-300-series/amd-radeon-r9-...
I also would suggest to Stress test your GPU card and see if anything unusual occurs during the testing. Plus run MEMTEST86 to eliminate defective RAM MEMORY in your computer.
You can try using OCCT which is good for Stress testing the CPU, GPU, & PSU.
This might eliminate a defective GPU or RAM Memory module causing those types of errors.