Earpiece stops working in cold conditions?
 

Hey there! Today during a long winter walk with my lovely N900 i've noticed that the earpiece has stopped working. After a while and some phone calls later (my girlfriend and here iPhone were nerved) i've found to press the thumb against the earpiece area cures the problem. Take the thumb away: no sound.

After back in warm conditions everything is fine now.

Can anyone in cold area of this planet confirm this defect?

Bye, Martin