Clutch slipping for 5 minutes below 3000 RPM

On one of my drives I dropped down a gear and noticed that it did not shift as crisp as usual.
When I got to the light, it seemed that each shift was slipping below 3000 RPM. I got really worried so I turned around and headed home, the same thing occurred at the unturn and the next light. But 4 miles later all was working as expected, crisp shifts fully engaged at 1500 RPM. I noticed on the forums that rain/snow traction setting will allow more clutch slippage, is it possible that the traction switch temporally failed causing the issue. It has only ever happened once.

PS: the clutch is 25% worn.