Grinding noise when switchingfrom second to third gear

[Stiv]

Hi guys.

I had this problem for last couple of weeks and it happens only when car is cold. And by cold I mean below freezing.

At first i thought I wast pressing clutch pedal all the way down, but then again, other gears work just fine. There is no grinding if I shift with 1 second pause between second and third and it goes away after 5 min of driving.

And it looks to me that downshift from fourth to third works just fine.

My warranty expires by the end of February. Should I wait for my regular yearly service which is in about one month from now or should I head to my mechanic right away?

Thanks