Hi so i just bought a brand new bass micro synth and my product was doing something i dont know if its supposed to do..

so after having the pedal engaged, and playing it for 40 seconds ish straight non stop, the filter drops very noticeably as if I moved the stop freq to like 40% ish. (or maybe even lower???)

I dont know if the pedal is supposed to do that or not im not sure, but I really dont like that it does that. I want it to just stay at a consistent level when im playing it.

I want to know if its supposed to do that, or if it is normal for the pedal, how can i fix that?

thanks