This problem started 2 days ago where I randomly experienced power loss whilst accelerating. When going from 1st to 2nd gear, there was a loud thud that you could feel in the car and the car wouldn't accelerate for a few seconds and was slowing down, the revs didn't go up either so the car wasn't in neutral. After this it accelerated normally and the car drove a further 20 mins without any issues. Then earlier today I again experienced random power loss when driving. On the DIS I noticed when the car stopped accelerating it said "D " and then after a couple of seconds it changed to "D3" as the car started accelerating again. This time I wasn't sure if the car was in 3rd gear before the power loss started or if it was in 2nd changing to 3rd. There are no fault codes but I'm a bit worried about this happening at the wrong moment and causing an accident e.g. if it happens when entering/leaving a junction or on a roundabout. I've got the 7 speed dry clutch gearbox btw. Any help would be really appreciated!