Too high dehydrator temp causes food to taste rancid?

jerri

I have been using a food dryer to cook sprouted grain bread and veggie patties, noticed both have tasted too sour, now think the temp may be to blame as it is over 120 degrees f. Doesn’t have a temp control but I think I may put clothespins between the plastic trays to let some air in or leave the oven door partly open when using that. Would that work? I would appreciate your comments thank you in advance. :)