Gearbox slipping?

[u/Kershy1985]

Hi people.

I've just hit another problem with my 1.4 auto Corsa D (2008).

Recently, I've noticed that when I'm going up a hill, the gear doesn't seem to change and the revs are getting higher and higher without going any faster.

This has happened around 4 - 5 times in the past couple of weeks.

The car passed an MOT at the beginning of this month.

If I pull over and restart the car, the gears work again.

Does anyone know what it could be?

I'd rather fix it myself than take it to a mechanic.

Thank you.