I have an '07 F350 4 x 4 with a V10 engine. I have problems with the transmission randomly downshifting and the check engine light would come on. After scanning we installed new plugs and checked all the solenoids in the transmission, replacing one and a new trans filter and fluid. Worked fine for a couple of weeks and started acting up again today after driving for about 50 miles (94 degrees today). No check engine light or flashing o/d. Any thoughts?