Topic: Automatic transmission losses strength sometimes

I am the owner of a 1995 Toyota 4Runner, 4 doors, SR5 V6 with a 3.0 EFI engine. About a year and 3 months ago, its automatic transmission began to lose strength occasionally even though it was accelerated. The vehicle might run apparently well sometimes, and then unexpectedly lose strength and not be able to pass a speed rate of some 30 miles per hour.

When this has occurred I have noted that the speed revolutions meter moves up then very fast. However the motor vehicle will not move much more faster even though one accelerates it. The problem described is not something that happens all the time, but rather unexpectedly.

I took the car to a few reliable mechanics that were knowledgeable of Toyota motor vehicles although they were not Toyota employees. Three of them scanned it, and they all informed me that they could not detect the cause of the failure. One of them made a full repair of the automatic transmission, but unfortunately that did not solve the problem.

I will appreciate your kind feedback on the matter in terms of other possible solutions that might exist or may have been overlooked.