Auto gearbox Issue, works fine for 8 mins then it begins to rev and does not change gear

[zed27]

Make. Hyundai
Model. i30
Engine size/Type. 1.6 diesel
Year. 2011
Mileage 42000miles
Hi All.
I have an Auto gearbox Issue, it works fine from cold for 8 mins once engine is at temperature then it begins to rev and does not change gear as if the gearbox has lost traction.
If I turn the car off and restart the problem is gone for another approx 5 mins and then comes back again.
Any ideas what this can be and roughly how much will it cost.
Thank you for your time.
Regards
Zed

 

[Burnerman]

Not a great deal you can do yourself with these gearboxes apart from checking the two electrical plugs underneath that go into the box and change the lubricant.......
Personally I'd be heading for an independent gearbox specialist with this one, and that wouldn't be Hyundai.
John

 

[zed27]

ok.
thanks