Car Slowed Down On Its Own problems of the 2001 Toyota RAV4

Erratic shifting on my wife's 2001 Toyota Rav4 (140,000 miles). Could not accelerate along with random downshifts. This was very dangerous on both surface streets and highway driving as vehicle would not accelerate when needed or radically slow down when it sporadically dropped into a lower gear. Took the vehicle to elk gove (CA) Toyota (egt). They indicated that the transmission was low on fluid (it was not, I checked) and recommended a flush. They flushed it and stated it was tested and ready to go. Problem was not solved. Egt then stated I needed a new transmission and possibly a new ecm. I chose to research the problem and towed my vehicle home. A quick search revealed numerous complaints on Rav4 ecm problems and several secondary markets repairing these defective units. Sent my unit out and had it repaired -problem solved. It appears that Toyota is not acknowledging the problem with the defective ecm. Had I not researched this, I would paid for a new transmission and ecm. In defense of egt, they did reimburse me for the transmission flush, but they still insisted that I needed a new transmission. Please add my complaint to any others you may have regarding Toyota Rav4 ecm problems, so that Toyota might admit that there is a defect in the units. My wife has always sworn by Toyota products - the recent swearing associated with Toyota is not the kind a company would covet.