jimny - mysterious grinding noise

Hi! I have a big jimny issue and since I couldn't find any useful answer on Croatian forums, (where I live) I thought "try with British, sure they'll know".Sorry about my english, but hope you'll be able to understand.Now about my problem... Jimny was the car I iwanted so badly for a while and November 2013 I bought a new jimny (2013). At first I admired that car, but now, with this unresolved issue... I don't know anymore what to say. Well, let me describe. While driving, suddenly a grinding noise starts and it seams like my jimny is about to fall apart. I had a car about 3 weeks when this happened the first time. Previous to this I was off road (using 4x4 just for a short part of road) and just returned on the city road (2x4), driving about 50 km/h. Next time this happened car was about 2 months old. On the highway, at speed of 120 km/h. Ever since this happens once or twice a month. Mysterious terrible grinding noise, can't even say for sure where it comes from. It is so loud that I could not judge. It seamed it was somewhere in the area of front wheels. Sometimes it seams like metal grinding, other time it seamed to me it was rubber-grinding noise. I drove about 2 miles before it mysteriously stops. Noise disappeared by itself (first time). Next time I stopped an engine. The moment I started an engine again, the noise was gone. Third time I stopped the car, with an engine running, than switched 4x4 for a short while. Grinding disappeared. Can someone, please, help? Anybody with the same problem? Any clue what this could be about and how to resolve it? Thanks and best regards from Croatia.

I'm struggling to even picture what could be at play there. I've never heard about this happening before.

Does the car violently shake as well or is it just a noise??
Could the hubs be locked in or partially locked in? Might account for the noise?
Maybe the kingpins & Wheel bearings?

I dunno.

Id start by checking everthing at the wheels, brake pads/disks, rear shoes, wheel bearings.

Its hard to know what to suggest without hearing it first hand.

Brakes just fine. Car is new, discs are new. Everything seams to be fine, but something is obviously wrong. Took it to the dealer. (Car is under warranty). He payed almost no real attention and said nothing is wrong.

This could be the same as the noise I'm getting. I've traced it down to the drivers side front locking hub. When in 2WD it sometimes try's to engage the locking hub. If I switch to 4WD the noise goes away and I can select 2WD again. It might not make the noise for days and days then do it twice in 10 mins!

Anyway next time it happens open the window and stick you head out then it's easy to tell if it's coming from the front hubs. Also try jacking it up and see if the front hubs lock in.

If you find a cure let me know as I'm not sure where to look next, not sure if it's a hub issue, vac issue or switch problem.

Jack up each wheel and check for excessive play, could be a wheel bearing..............they can make all sorts of different noises.

Do you have more steering lock one way than the other? Could be a CV joint.

Have you tried jacking it up and rotating the wheels to see if theres any binding/grinding/horrible noises?

If you hear a noise while doing the above............

Its all a process of elimination without being able to hear it personaly, disconnect the props which will eliminate the t-box which will tell you if its the diffs and you can rotate the tbox by hand to see if its that aswell.

Does the noise come and go or is it perminantly there?