I read in the thread mentioned in my previous post that if I pump the clutch before driving that it would go away and it did. I pumped it about 10 15 times and then drove off as usual. The difference was night and day. I was able to shift smoothly and easily without that grabbing or thumping sensation I feel often.
When the problem is happening, it feels like when I am slowly engaging the clutch after shifting, it lets go and just grabs the flywheel abruptly resulting in a slight reduction of speed and momentum and a general bad feeling in my gut.
Maybe this is a better explanation than my initial post. Appointment on Monday if the problem persists. I don't want to bring it in unless it is happening. The service manager ay te must reproduce it before performing any repairs. .