I loved my T90 back in the day, but it started doing the EEE message and I stopped using it. Fast forward to a couple months ago when I bought a T90 on eBay because it had been recently serviced and was supposedly in great condition. It was and it shot a roll of film perfectly. Then the weirdness started happening. I didn't get any EEE errors but suddenly the camera would make a soft humming noise when you press the shutter button but it never took a picture. I ended up sending it back but along the way I tested some things. What was 100% reliable in getting it to fail was using Energizer lithium batteries. You would put them in you would take a couple shots and everything seems fine, but leaving them in the camera overnight with it off caused it to lock up the very next time you try to use it. Apparently there is something about the amperage in those batteries that causes issues. I used some 1.2v Eneloops in it and it was fine. They even funnier thing is that the eBay auction listing specifically recommended you use the Energizer lithium batteries. I guess they never left it overnight huh?
If you want to use a T90 keep this in mind. May save you a few headaches.