Auto's gone spastic
Hey all, lately the 4 speed auto has been playing up, rather unusually. And I have noticed that this has only happened at night, and is usually a week or so inbetween incidents. What happens is I could be driving along a flat road doing whatever speed, and it will all of a sudden have a hissyfit as to which gear it should be in. It will shift down a gear or two, then shift up again, shift down, so on. This will happen from anywhere between 2 - 5 seconds. But tonight was the strangest. It would shift down a few gears too many and rev very high (I was doing 80) and after its few seconds of messing around with the gears it would stay in third, even if I stopped. As I took off from an intersection it would stay in third and be sluggish as all hell. The manual shift worked ok, although putting it from 3 to D didn't put it into top gear. Also when I shifted manually the shifts felt a lot harsher than normal, and also it was like this when it was shifting itself.
Any ideas on what's going on here? Could the auto ECU have shat itself? Or is there something else it could've been?
Thanks in advance