PC huge lag

My PC has started to make a 2-5 second lag where it disconnects-reconnects my headphones. so it restarts the Realtek driver or at least the program. It happens after 45-60 min in idle or when gaming. It makes the sound as it does when it reads from a harddisk.

Specs: Asus B250-prime-m I7-7700 Geforce 1070 Recently upgraded from 16-32GB ram, the lag started before upgrade. Samsung SSD 250GB WD 1TB HDD Kingston NVMe 250GB and 1TB (1TB upgraded after lag started)

I've run diagnostics on CPU - no issues found Crystal disk on Harddrives all said 100% (HDD only said good, no percentage)

My last idea is it could be an error from my HDD which makes no sense since everything relevant is on my Samsung SSD.