The problem with 2 channel mode

I had a strong subsidence fps in games (about 90 to 35)
As was the case in the high latency RAM (90-100ns)
I put the RAM in 1 and 3 slot
The problem went away, the latency dropped to 60
Frames are stable (variation is only 2-4 frames)
But the game began to fly
The game may freeze or crash most often happens when you change applications, and graphics settings
Once even passed out in the computer
Any ideas how to fix?