How can poker be so easy, yet so hard?

[Peleus]

I seem to go through this cycle a lot.

I just moved up, I go on a heater, and I'm on an upswing. Went up about 9 buyins in 1000 hands. Poker is good, every decision is right, or at least working, people folding to your cbets when you want them to, paying you off when you have a hand. Poker is easy, every decision you have confidence in.

Then it all stops, the heater ends and people start calling down those cbets, every monster is folded, no matter what you can't get it right. The buyins start dropping, those AA's get cracked, and poker is hard again.

Anyone got any tips for coming down off a heater? I'm trying to drop back down a level, so any bad play I'm doing has less of an impact on me, or is absorbed more. Should I keep doing what I was doing during the time everything was fine? Is it just one of those things the cbets are getting called down now, or should you adjust you're game?

How do you deal with coming off a heater, and getting back to grinding when poker becomes hard again?