Inconsistent velocity when repeating notes

I’m enjoying The Grand 3 and specifically the Model D. But I consistently run into the problem of when repeating the same note, the first note returns the desired velocity, but the following two (of the same note) are more quiet. So, I play middle C three times and it sounds as “loud, soft, soft” and then back to loud on the fourth. This is the pattern I get. Has anybody experienced this and is there a solution?
This is in standalone mode.
VAIO core 2 duo 2.56ghz 8200/4gb RAM/no other apps running

I just had to reinstall it and everything seems okay. I have no answer how it got that way, but no matter.