What kind of oil did you use?
Most modern motor oils have friction modifiers that will make the oil very slippery and cause the issue you. I had the same problem, maybe worse, when Mobile1 changed their formula to one the had friction modifiers.
There is a discussion hear:
Obsolete API Oil Ratings
I have only found one available locally that does not have these friction modifiers. Shell Rotella T This is what I use.
For some reason this does not seem to be a problem for everyone. It would not surprise me to find out that Suzuki uses clutch plates from more than one manufacturer and some are not affected.