I use 3-4 Line 6 Dl4s in my setup and have been noticing an issue with the metal Toggle switches on them as of late. It seems that they get worn out quickly and start getting jammed at horrible & crucial moments. Maybe I am too hard on the metal toggle switches when I stomp down on 'em but, I do not think that is the case. Have any of you ever had this sort of problem with your DL4? thanks! c.