The first thing I usually try is manually setting the voltage.

2 DIMMs per channel is still dual channel.

Should have bought two sticks. There is no upside performance-wise to having more sticks than you need.

14900k

LGA1700 is only dual channel.

4 slots != 4 channels.

If you want 4 channels, you need a platform that supports 4 channels (ie: use 1 DIMM per channel to get full rated speed and stability). Putting a 4 channel kit on a dual channel board is going to have the same result you’re already dealing with. 2 DIMMs per channel simply isn’t as stable.

I see some people mentioning radio crosstalk, but that’s just not possible with modern phones. They all use at least some basic level of digital encoding/encryption.

This could happen, though, while it was traveling over the phone system’s much older backends.