Random 5 beeps on cold boot / first power-on of the day

Hi everyone,
I’m looking for help diagnosing a weird boot issue that started recently.

Specs:

• CPU: Ryzen 5 7600X
• Motherboard: B650 Lightning
• RAM: 4×8 GB DDR5-6000 kit
• BIOS: updated to the latest version

What’s happening:

• On the first power-on after the PC has been completely off for a while, the system almost always beeps 5 times and then boots normally.
• Once it has booted, the PC seems stable. Memtest has been running over night with no errors.

What I tried:

• Updated BIOS to the newest version → no change
• Reduced RAM speed step by step because I assumed it was memory instability:
  • previously stable for ~3 years at 5600 MT/s (XMP)
  • tried 5400 / 5200 / 5000
  • now even running at 4800 MT/s
• The 5-beep issue still happens even at 4800.
• Disabled fast boot

Context:

• The issue started 2-3 weeks after I moved to a new place. The PC is now closer to an outside wall, but since it also happens in the afternoon (not only in the morning/cold), I’m not sure if temperature/humidity is relevant.

Is this something to be worried about?