Are you using the SA tap switch? Also what was the supply, I don’t see what you mentioned, if it’s not providing 180mA of current, you’ll definitely get some unwanted behavior from the pedal.
Sorry, what I meant was the power supply used 3 mos ago when I've got the EQ2 up until now with the external switching problem are the same. It is a one-spot type 2000mA. No issues before.
I am using a different external switch (difficult to get the switch here in AU, pre-order needed).
I unplugged the ext. switch to see if there's a short somewhere with it. Nothing's wrong with the switch, so I then set the EQ2 to select preset up/down and still with the external switch/control input cable unplugged to check if the EQ2 triggers the preset button by itself, and it does. Factory reset done. I'll have to check with it again later, might get rid of the external control if problem still occur, I need it though