Guitar Rig 5 has worked fine until last several weeks, and it gets the preset bug all of a sudden. This bug was well-known among many users, and I finally got it. It switches the preset randomly.
The installed version was 5.2.2 R2R and downgraded 5.1.1 as some people said that they solved the issue after downgrade, but it doesn't work.

https://www.native-instruments.com/forum/threads/guitar-rig-switching-preset-on-its-own.27695/

As you can see, NI hadn't fixed it for a long time and some users still have the issue. So, I'm wondering if it's just me or everybody.
Just in case you ask me, "Why don't you use Guitar Rig 6 instead?", I tried it, and it eats CPU power twice than 5.
Has anybody solved this issue perfectly?

 

Last edited: Jun 20, 2022

I just found the solution. It came from the automation lane. The midi files I downloaded contain some weird automation lane that names Program Change. Since I removed it, the issue had gone. What I don't understand is that only Guitar Rig is affected. Probably every guitar amp sim uses different logic.
Just in case for ones who probably are struggling with this issue.

 

Last edited: Jun 20, 2022