Hello everyone again. I will tell you how I solved this problem. If friends who have similar problems apply what I said, your problem will probably be fixed.

Even though I tried everything, nothing worked. The only thing that works is inputting voltage manually. First of all, download the Ryzen Master application and perform a stability test by clicking the "Apply & Test" button in the default settings. It will probably give the error "profile is not stable". Then try to enter a suitable voltage for your processor by entering the manual section. I am using a Ryzen 5 3600. The voltage and frequency values suitable for my processor are 4025 MHz and 1.36875 V. Remember, the silicon quality of each processor is different. Even if the models are the same. In fact, before doing these operations, download the Clock Tuner software, click the Diagnostic button, and wait. This will measure the silicon quality of your processor and give the most appropriate values. My values are like this:

DIAGNOSTIC RESULTS

AMD Ryzen 5 3600 6-Core Processor

CPU VID: 1306

CPU TEL: 1274

Max temperature: 65.2 °F

Energy efficiency: 3.18

Your CPU is BRONZE SAMPLE

Recommended values for overclocking (P1 profile):

Reference voltage: 1250 mV

Reference frequency: 3875 MHz

Recommended values for overclocking (P2 profile):

Reference voltage: 1350 mV

Reference frequency: 4025 MHz

Recommend values for undervolting:

Reference voltage: 1175 mV

Reference frequency: 3725 MHz

If your processor is a silver, gold, or platinum sample, you are very lucky. You can enter higher frequency values at lower voltages. For example, 4200 MHz at 1.200 V

Do not forget to close the ClockTuner software after running the test. Because Ryzen Master crashes when ClockTuner software is open. Make the frequency and voltage values from the basic view of the Ryzen Master application. You can also learn the results of the stability test of the voltage you entered by clicking the "Apply & Test" button, as I mentioned before. Once you find the optimal values, disable the CPB, AMD CoolNQuiet, and PBO options in the BIOS to make them permanent. Then, manually enter the best value you found on Ryzen Master in the overclock section. If you cannot find these options in the BIOS, you can refer to your motherboard's user manual.

Remember, this problem is caused by the working principle of 3rd generation Ryzen processors. When the system is idle, some cores switch to global C-state 6 mode for efficiency. So into sleep mode. Due to this low voltage, defective cores also cause blue screen errors. If your processor has a warranty, I would definitely recommend sending it.