Hi people !

Something very intriguing happened to me a few hours ago. I'm mining Dopecoin an alt that uses scrypt.
I'm using the 02-04-14 version with auto-tune. The most I got in all my tries was around 200kh/s with my gtx 670.

I restarted cudaminer without looking at the output and was surprised to hear the fan of my GPU working a lot faster.
I look at the cudaminer window and was shocked to see it was mining at 340mh/s !
I scrolled back to see what config auto-tune used and it was k14x28. I checked on the pool stats to see if the pool was getting the same hash/sec and it was.

Usually my gpu is at 63°C and this time it was at 85°C. I thought I was a jerk not to have noticed I could mine a lot faster earlier and decided to solo mine instead of pool mining. Setup a new .bat with -l k14x28 and got the usual 200kh/s again.

I could not get the 340mh/s again (solo or pool mining)... Tried a lot of times to have auto-tune figure it out again but it did not :/

The gpu usage was the same when mining at 340 or 200mh/s only temp changed.

Did that already happen to anyone else ? How can I get this mining speed again ??