"I've used it for 100s of hours without a problem"

You must have more luck than the rest of us. The last time I used it I discovered the following bug:

If you type in three identical characters it sets bit 7 on the third character. If you keep on typing that same character every second one after that has the high bit set. I wasted a whole afternoon debugging perfectly good code because of that.

I even checked it's output with kermit and didn't spot the problem as kermit defaults to truncating the high bit.