All the big Jap 4 had their problems mate. Suzuki thought that rotary engines might be a good idea, and Kawasaki had problems with their early EFI and their Turbo 750. (great bike that it was)
I think the problem was that they were in such a hurry to get their "Latest and Greatest" bike into the showrooms, that their R&D didn't have enough time to test them, and find all their faults, before the new owners got their mitts on them.
It's a shame, I had an early TX500 and I loved it, but I knew it was a potential hand grenade.