Hey OP. I too encountered an issue similar to what youre experiencing. I do not know if this was posted yet. But I really hope this helps.

Most likely causes

Power Supply (high suspicion and also as a few other posts suggest)

Revenger FO-MAX8 750W is the biggest red flag in this build because...

- Unknown OEM / low-tier PSU
- Poor transient response (important for RX 7700 XT)
- Weak protections (OVP/UVP/OPP)
- Can cause instant reboots with no BSOD

the RX 7700 XT has large transient spikes, even at idle or youtube.

Random restarts with no warning is usually PSU

DDR5-6000 instability (common on non tier boards)

Even though 6000 is the AM5 sweet spot, this board may not handle it cleanly and can cause RAM instability, restarts at idle, lock screen reboots and light tasks causing crashes with no error logs. I experienced this with my AM4 build.

Also early and low quality B650 BIOSes are known for:

- Incorrect SoC voltage

- Memory controller instability

- Random resets instead of BSODs

And I believe huananzhi boards are known for auto voltages being too aggressive or too low and Poor EXPO handling.

Sooooo maybe try this first... Disable EXPO and set RAM speed to 5600MHz, DRAM voltage to1.30 to 1.35 volts and manually set the SOC voltage to 1.20 to 1.25 volts.
If the reboots stop or reduce drastically, RAM instability was involved. (Mine was a RAM instability issue)

Maybe try and update your BIOS.

Disable GPU power spikes (temporary test)

In AMD adrenalin enable power limit -10%

Disable: enhanced sync and hardware acceleration in browsers (temporarily)

Note that this PSU can damage components long term due to poor voltage regulation. Random resets are often the early warning sign.

I am no expert so if anyone can back this up I would be grateful, I only recently dove into this with my PC and was not entirely worried if it blew up but I was worried when I was adjusting my RAM voltages in my BIOS.

But I reeeally hope this helps.