Patch switching

Dear Forists, since some days my Shruthi swiches Patches on ingoing Midi Notes. Maybe it has something to do with the internal sequencer?
I just want to switch this off. Can somebody please give me a hint?

You are probably sending program changes too. What do you sequence with?

Thanks for the reply, i’m sequencing with my own SEQ12. I’m sure it sends no PC/Sysex

Solved. It was a problem of an old 8x midi thru generating corrupt data.

great that you solved it!